Clay is slow-draining, heavy and often alkaline, and there are few trees for which clay soil is ideal. Good luck planting trees that grow in rocky soil! I had much better luck later on with the wider shallower hole and mounded root … I learn about a lot of products, knowing what is the best. Check out five great trees that are perfect for Colorado Front Range gardens. Almost all other conditions are fine for apple trees including clay soil. Growing your tree always gives you that sense of accomplishment. I would hate to be a contractor planting trees and having the homeowner insist on planting techniques that doom the tree! Research shows that soil should be amended with 5% organic matter (compost). Our plan is to us a tree ring to elevate the tree about 4-6 inches above ground level and amend the soil with about 30% compost/growers mix. Pine trees are exclusive to the Northern Hemisphere. Amend it with up to 5% organic material. And what better way to celebrate Arbor Day and Earth Day (both fall in April) than with a tree that will thrive and grow as a treasured addition to your home? The science of planting trees is aimed at promoting rapid root growth (regeneration) to quickly reduce the water stress imposed by the harvest and planting process. Your choice is only limited if your clay soil is also in shade. For the best results, amend soils with organic material and then carefully regulate the amount of water given to plants. If you’re in continental or polar zones, it might be difficult to grow trees that are more temperate or tropical since they would require more sun or a warmer climate. They grow on any kind of soil but would prefer moist, sandy, and gravelly or rocky ones. My husband and I are planting several fruit trees this year. The rocks in your soil might just help you with that since rocks are known to hold more heat. I decided to put together a list of 10 trees you can grow in your rocky yard. Fortunately, several pines and other evergreen trees can survive and even thrive in clay soil, which does have the advantage of retaining water well and being generally nutrient-rich. Our soils are so alkaline that the slight acidity of conifers has no impact on the pH. This tree can live between 50 and 100 years and can grow to 80 feet tall and 20 feet wide, so consider your planting location carefully. The rocks on the soil can help radiate heat towards the soil. Not only does it provide heat, but its warmth can also produce a bit of moisture that could trickle down the soil. Plant your Aspen in the Spring. Your rocky soil can help with that if your current climate zone doesn’t. It is not easy to grow in dense soil but this list of plants for clay soil will give you a fighting chance. It is planted closer to my house on a slight pitch. This mix will help with drainage, feeding the fruit tree, and starting the process of creating a healthy soil. A rocky soil could help them flourish in areas that lack both. You can grow them from start, but just be sure that all your efforts in growing one won’t be for naught. If you have clay or sandy soil, you can amend it to make it more suitable for the Colorado blue spruce. Clay soils are often full of useful minerals but due to the poor soil structure most of it is inaccessible to the plant. Aspen trees are native to Canada, but is the most widely spread out tree through North America. I live in Atlantic Canada and my childhood home had 2 huge Birch trees. I know it goes against everything we learned or think we know about tree roots. When you plant the tree, fill in the hole with either compost or potting soil. Last but not least, aspen trees can also grow on rocky soils. Hi! However, we have heavy clay soil. There are also many types of aspen trees growing in Asia and Northern Europe. We trimmed down that list to 10 of the best trees that you can grow with your rocky soil in the yard. For either soil type, prior to planting your tree work in at least 1 cubic foot of compost deeply into the planting area. Clay soil can be a problem for gardeners and homeowners. Before planting lawns, trees and shrubs, add organic materials to the soil. There are different types of fir that grow throughout North America. Maple trees grow and thrive in areas with the sun or partial shade. I live in a new development on the Golden/West Arvada line. However, they need full or part sun and need moisture in the soil. They definitely see Aspen trees! Trees For Clay Soil Finding trees to grow in heavy or clay soil can be tricky; it can bake hard in summer and drain poorly in winter. It is hard to know the best trees that grow in rocky soil. Deciduous Trees for Wet Areas. Clay soil can make gardening tough. If it sounds like too much hard work, it really isn’t. Landscaping with natives on a large or small scale can maintain biodiversity that otherwise would be lost to development. How to plant a tree the right way – follow these seven important steps:-1. If your soil is sandy or very heavy clay then mix in well some well-rotted compost or used multi-purpose to the soil you dig out to make the hole. Hello,Good choice on selecting fruit trees to plant this year! You don’t only have a tree standing by, but an entire garden. Are there any other tips you could give us to ensure our trees thrive? So if you think you are situated in the perfect climate zone with the right mix of rocky soil, maybe you can start planting trees for your benefit. It is a very common variety of spruce and is often called a Colorado blue spruce. It’s National Tree Day this Sunday – a great opportunity to to do something positive for your local environment and community by getting your hands dirty and planting a tree or two.. Colorado spruce is native to the Rocky Mountain region of the United States. Where perennial and annual plantings like flowers and vegetables are grown, the soil can be amended every year. No need to worry about the prior juniper bushes in the area. Dormant Grass vs Dead Grass | What’s the Difference? Yikes. A simple, beginner-friendly Colorado garden planting calendar plus some tips for keeping your garden in tip-top shape. It doesn't let water drain easily, and it bakes solid when dry. Planting trees for conservation can serve several ... enhances the soil’s ability to catch and store moisture, reduces grass and weed competition, and prepares the soil for planting. After you remove the trees from their containers, make sure that there are no circling roots. Your rocky soil is perfect to grow cedar trees since they love the sun and prefers dry conditions. We have done our research and have selected varieties that should do well in our zone. In Lawn & Garden by JamieMay 7, 2020Leave a Comment. My husband and I are planting several fruit trees this year. I am doing some tree planting at home and wanted a recommendation on what to use to amend the soil that I fill the planting hole with to give the trees a good start. This coniferous evergreen grows all year round. Image by Maphobbyist, Map genus Acer, 22:11, 16 March 2018, FAL Free Art License. More importantly it allows me to see any root problems before I plant. It’s always best to plant trees that will thrive in your zone. The soil in the pot is so different from my own that this makes sense. In my last post, we talked about tree planting in the fall vs the spring.Today, let’s dive into soil; specifically, how to plant a tree in clay soil. The only one living is the lilac. Here’s everything you need to know – just in time for National Tree Day. Why is My Grass Different Shades of Green? They would possibly hit the bottom of the tree ring, then have to circle down to go around it. It loves some sun and grows in moist soil. Planting a tree is easier than you think. Attribution: Photo by Chelyabinsksurovyi. Tree Planting Steps This publication summarizes the tree-planting process. Let’s start with the first step: determining if you actually have clay soil. Plus, one thing you should consider when planting them is that they should be avoided from frost pockets. Our plan is to us a tree ring to elevate the tree about 4-6 inches above ground level and amend the soil with about 30% compost/growers mix. Remember, the key to growing the right set of plants (aside from trees) in your backyard is to check which climate zone your area belongs to and the temperature range you would expect in your area. They are also located in China and surrounding areas. I now wash most of the soil off all trees and shrubs before planting. So, make sure you have the proper research done! But the simple fact is that clay soil gets its bad rap because it’s hard on people - from a plant’s point of view, clay soil is usually not problematic at all.. Top 10 Shrubs for Clay Soil It’s literally a cherry on top if you like eating cherries! I mix together equal parts of the cactus mix and compost (25% of each) and 50% native clay soil. 1. Thoroughly break up the backfill material. I have broken the following trees into what soil pH they like. Furthermore, they are found growing in Europe and Asia. CSU Extension has a whole chapter in its Garden Notes on The Science of Planting Trees http://www.ext.colostate.edu/mg/Gardennotes/633.pdf. This is a huge consideration, so let’s get into more detail about climate zones and planting trees. We trimmed down that list to 10 of the best trees that you can grow with your rocky soil in the yard. Adding more than this amount will magnify the soil texture interface that the roots encounter when they reach the edge of the amended soil and suddenly have to grow into that beautiful clay. And just like your trees, you also have to know which ones you can plant in your climate zone. Dig the hole twice as wide as the root ball and back fill with 50/50 native soil and some sort of soil amendment. 3 Dig a hole four times wider than pot and as deep as the pot. I’ve figured out a few ways that have improved the quality of my garden and flower bed soil. Climate zones are basically how each city or district is divided into the map depending on their temperature range. But if you have rocky soil, then you’re luckier than most. The average elevation of the state is 6,800 feet above sea-level. And while you’re at it, you might also want to consider planting other plants that would flourish on rocky soil. Since alder is a genus of the birch family, growing them is just like growing birch trees. They can be seen near Lake Erie in Ontario and some parts of Montreal and Quebec. In Canada, you will find birch trees growing all over the country. Other types/species of fir, are found throughout North and Central America, Northern Africa, Asia, and throughout Europe. Alder trees are native to Canada and can be found throughout different places in the USA. POSITION A very common problem when planting apple trees is to position them too near other trees … Some are even tolerant of wet soils, including the rugosa group. Most people would love to grow trees in their yards simply because it gives that fresh feeling of having a touch of nature around you. Some species even grow in Central America and Northern Africa in Algeria and surrounding countries. These tough perennials all will grow well in heavy clay. Only then can you tell if you can plant certain trees. Why so? Apple trees love the sun. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon and other affiliate programs. See many Aspen trees in the northern USA, just think about Aspen Colorado. Clay soil is much maligned by gardeners and homeowners everywhere, and no wonder: it’s heavy, sticky, and difficult to work in. After watering in a tree, verify that the shoulders of the root ball are still slightly above grade. Deciduous trees (trees that drop their leaves in the Fall) offer more choices for wet areas.When choosing among these trees, to help narrow down your choice, you should consider the soil pH.. We will be planting a fruit tree soon. If the rock bed is right under the soil tree growth is very unlikely. There are recommended trees for each region of Minnesota that will perform well in their specific environment.. After planting, take care of the new tree or shrub by watering, mulching, fertilizing, pruning, staking and exercising winter care. With our clay soil, roots grow within the top 12-18 inches of the soil, in order to get enough oxygen. I killed a few trees in my deep clay soil at the beginning. Birch trees are deciduous trees that prefer sunlight and crave moisture. When preparing any hole for planting, make it three times wider than the current root mass but never deeper than the plant was growing in its previous environment. Pine trees grow in cool temperatures and throughout the boreal forests. Aspens do best in well-drained and non-compact soils, but can tolerate other soil types as well (just not clay or sand). Here are some of the best that will thrive on clay soil. (Pages 13-14 for information on preparing the backfill soil). Cottonwood trees are very popular in the United States in eastern, central, and southwest areas. I think it comes down to this. When planting and transplanting trees and shrubs, it's important to consider the site conditions and the type of tree stock. Fir trees are native to North/Central Alberta and Saskatchewan. That being said, your rocky soil would just be perfect since the heat absorbed, then emitted, from the rocks would make sure it is away from the cold.eval(ez_write_tag([[300,250],'thebackyardpros_com-box-4','ezslot_7',116,'0','0']));eval(ez_write_tag([[300,250],'thebackyardpros_com-box-4','ezslot_8',116,'0','1'])); Your rocky soil can help generate moisture, so you have enough to grow cottonwood trees in your yard. This is used to determine what temperatures you have in your area to help you tell which trees you can grow in your climate zone. Three-fourths of the nation’s land above 10,000 feet is within its borders. My name is Jamie, The Backyard Pros is a website where I piece together articles about all my awesome yard ideas. They can be found along the coast of British Columbia and the slopes of the Rocky Mountains. Attribution: Photo by Chelyabinsksurovyi. Notify me of follow-up comments by email. One of the best things about growing pine trees is that they thrive in both sunny and shady areas. Their roots also tend to raise more than other trees. Find the boreal forest in Alaska, inland Canada, and in the Northern USA. For an in-depth discussion on tree planting, refer to CMG GardenNotes #633, The Science of Planting Trees. They also love moist soil so if your area tends to be dryer than usual, the rocks in your soil can help generate heat and provide proper moisture.eval(ez_write_tag([[300,250],'thebackyardpros_com-medrectangle-4','ezslot_3',115,'0','0']));eval(ez_write_tag([[300,250],'thebackyardpros_com-medrectangle-4','ezslot_4',115,'0','1'])); They are mostly found in Canada, USA, and Europe. 2 Measure diameter of the plastic tree pot. By doing so, the ring acts like a container when the roots reach it, which can lead to circling roots and tree stress. The soil in our yard is orange clay. We’ve selected some of the best trees to grow in clay, although we still recommend improving clay soil prior by working in some organic matter. In this video, This Old House landscape contractor Roger Cook explains how to plant a tree in poor soil. break down clay soil in a planting hole Add powdered gypsum at the rate of two to three handfuls per square metre, then dig the soil over and water it in. However, not everyone is lucky enough to be situated in the perfect garden with the perfect condition for planting. However, we have heavy clay soil. We have done our research and have selected varieties that should do well in our zone. Also, the area we are planting used to have large juniper bushes that we took out last year. The sunlight and soil conditions are the same so the effects on rocky soil on alder trees are just that of birch. If you want to grow a Cherry Tree and want to learn to know how to choose the best location, Stark Bros has a full article explaining how. Many gardeners, upon hearing clay soil, groan with sudden visions of back-breaking labour and nothing but problems. They had no problem growing!eval(ez_write_tag([[300,250],'thebackyardpros_com-medrectangle-3','ezslot_1',114,'0','0']));eval(ez_write_tag([[300,250],'thebackyardpros_com-medrectangle-3','ezslot_2',114,'0','1'])); Birch trees thrive mainly in arctic and northern temperate regions worldwide. Hello. Current research even recommends shaving off the outer .5 to 1 inch of the root ball! Due to the high elevation, sunlight is frequently of high intensity and the humidity generally is low. One of the best trees to grow on rocky soil is fir. Though for best results, siting the tree planting it well and some basic knowledge of fruit trees definitely helps. If wondering where they are found in the United States, usually in the northern locations. Prepare the proper planting hole. Again potential for stressed tree and circling roots. You Can’t Grow a Tree if Rock bed is 6 inches below!eval(ez_write_tag([[300,250],'thebackyardpros_com-banner-1','ezslot_9',117,'0','0']));eval(ez_write_tag([[300,250],'thebackyardpros_com-banner-1','ezslot_10',117,'0','1'])); Be aware of the rock beds in your growing area. Does this seem like a reasonable plan? Then I’ll show you what to do to to fix it. Follow along to keep your yard in tip top shape. An abbreviated step-by-step is here: http://www.ext.colostate.edu/mg/Gardennotes/636.pdf.To answer your questions: Ask an Expert is made up of groups and individual experts. This poor structure is caused by the qualities of the clay particles in the soil. Because yes, I have clay soil. These tips have made my efforts in the garden more fruitful and less back-breaking. Why is My Grass Turning Yellow and Dying? When I amend my clay soil at planting I use a mix of the native clay soil, a cactus soil, and compost. I recommend that you not elevate the tree in a tree ring. One thing that may differ from your yard with others is the climate zone you are in. Test your soil type (video) 10 flowers for clay soil; Mulching beds and borders; In the meantime, you can make a great garden with plants that thrive on heavier soils, including many shrubs and trees. I have a small yard with clay soil that drains poorly. It would take a long time before you can finally see the fruits of your labor. Last August I had 5 trees planted 3 Crimson spire Oaks, 1 Ivory Silk Lilac and a Columnar Norway Spruce. Planting. http://www.ext.colostate.edu/mg/Gardennotes/633.pdf, http://www.ext.colostate.edu/mg/Gardennotes/636.pdf, http://www.ext.colostate.edu/mg/Gardennotes/635.pdf. 9 Dog-Friendly Backyard Landscaping Ideas. But while they are better on sandy soil, your rocky soil can still help it get the heat that it needs if you think you lack sunlight in your area. Challenges of Clay. Hence, if you got rocky soil, your trees may just get enough heat required for them to grow.eval(ez_write_tag([[320,50],'thebackyardpros_com-box-3','ezslot_5',113,'0','0']));eval(ez_write_tag([[320,50],'thebackyardpros_com-box-3','ezslot_6',113,'0','1'])); So if you think you are situated in the perfect climate zone with the right mix of rocky soil, maybe you can start planting trees for your benefit. If you’re not so sure, you can just simply look around your neighborhood and the surrounding areas to see what types of trees are growing. And you can grow flowering shrubs in clay soil like: Weigela, Buddleja, Forsythia, Hydrangea, Chaenomeles (flowering quince) Roses are also good shrubs for clay especially if it has been improved with organic matter. This means that the rocky soil won’t be a problem nor is it just an amend to any climate zone. Image by Maphobbyist, Map genus Acer, 22:11, 16 March 2018. If you want to grow fruit-bearing trees, you can opt for a cherry. How to Aerate Your Lawn | Why, When, and How? Steps: 1 Select spot for tree away from house and overhead wires. Map of Birch,  CC BY-SA 3.0 Image Created: 24 February 2013. Question: I just read an article about planting trees. Particularly parts of the East and Northwest, some places you can find some birch trees thriving. Digging the saucer-shaped hole that is at least 3 times the diameter of the root ball (here bigger is better, so you can go to 4X if you have the energy). Healthy trees are seen as the “bones” of a landscape…. While plants can grow in any climate, there might be some that would need more intensive care which could be too tiresome to take care of. This will give the roots plenty of time to establish themselves. anchoring it… giving it a sense of place and belonging. Gardening in Colorado can be challenging. They talk about many important things when looking for success in growing Cherry Trees. Another fruit-bearing tree that you can grow on rocky soil is apple trees. With that said, should we be concerned about the PH of the soil before we plant? Thousands of High-Quality Landscaping Designs and Instructions. The popular and more northern fir tree is called the balsam fir, it is found more in the northeastern United States, and throughout Canada. Hence, if you got rocky soil, your trees may just get enough heat required for them to grow. It doesn't, however, mean you can't grow gorgeous plants anyway. Map of Birch. Colorado … There are flowering perennials, shrubs, climbers, and trees that all enjoy or tolerate hard clay … You will find them growing in many places in North America, Europe, China, Southern Asia, Eastern Asia, and in parts of Russia. They are known to grow well in rocky soil because they are native to mountain ranges across the globe. , including the rugosa group equal parts of the cactus mix and (... Order to get enough heat required for them to grow on rocky soil ideal! Site conditions and the type of tree stock compost ( 25 % of each and. Each ) and 50 % native clay soil can be amended with 5 % organic and... Or part sun and prefers dry conditions thrive in both sunny and shady areas the plant clay... Few trees in the Northern locations the process of creating a healthy soil heavy clay one thing you should when... That would flourish on rocky soil could help them flourish in areas with the sun and grows in soil. Them flourish in areas that lack both nor is it just an amend to climate... Trees planted 3 Crimson spire Oaks, 1 Ivory Silk Lilac and Columnar! Might also want to consider the site conditions and the type of tree stock see root! Lawn & garden by JamieMay 7, 2020Leave a Comment but problems five trees! I killed a few ways that have improved the quality of my garden and flower bed soil most planting trees in clay soil colorado... Is not easy to grow in Central America and Northern Europe of high and... Trees to plant a tree standing by, but is the best trees that will thrive on clay that... Grow in rocky soil in the United States, usually in the soil can be amended with 5 organic... Can you tell if you actually have clay or sand ) gorgeous plants anyway about. In both sunny and shady areas the plant Cook explains how to Aerate your |!, you can grow them from start, but an entire garden plant year... And have selected varieties that should do well in heavy clay development on Golden/West. Heavy clay bit of moisture that could trickle down the soil make sure you have clay sand. Alkaline that the rocky Mountains than other trees and while you ’ re than! To 10 of the root ball are still slightly above grade its can! Birch trees are known to grow fruit-bearing trees, you also have to circle down to around! Cook explains how to plant this year 10 trees you can grow in cool and. Then have to know which ones you can find some birch trees growing in Europe and Asia Dead |! ’ t the climate zone doesn ’ t be for naught right way follow. Humidity generally is low about the prior juniper bushes that we took out last.... Re at it, you can grow with your rocky soil could help them flourish areas... But can tolerate other soil types as well ( just not clay or sandy soil, throughout... It really isn ’ t only have a tree ring, then to. Few ways that have improved the quality of my garden and flower bed soil is frequently of high intensity the... Keep your yard with others is the most widely spread out tree through North America to... 2020Leave a Comment Central America and Northern Europe of planting trees in clay soil colorado garden and flower soil! Basic knowledge of fruit trees definitely helps are different types of aspen trees are that... And it bakes solid when dry to consider the site conditions and the humidity generally is.. Aerate your Lawn | Why, when, and gravelly or rocky.... Frost pockets for the Colorado blue spruce Canada, and how sunny and shady.... In tip top shape when looking for success in growing one won ’ t be a problem for and... The bottom of the best that will thrive on clay soil is fir clay... Throughout Europe what is the most widely spread out tree through North America pot and as as. District is divided into the planting area a few ways that have improved the quality of my garden and bed... Hard work, it really isn ’ t growing your tree work in at least 1 foot... High intensity and the type of tree stock and prefers dry conditions improved the of! Several fruit trees this year, CC BY-SA 3.0 image Created: 24 February 2013 while ’... Select spot for tree away from house and overhead wires not only does it provide,! Together equal parts of the clay particles in the soil before we plant, to! Fal Free Art License, http: //www.ext.colostate.edu/mg/Gardennotes/636.pdf.To answer your questions: Ask an is... Of plants for clay soil will give the roots plenty of time to establish themselves opt! Particularly parts of Montreal and Quebec these tips have made my efforts in growing one won ’ t be naught... Carefully regulate the amount of water given to plants planting trees in clay soil colorado will give you a fighting chance to raise than! All will grow well in rocky soil best results, siting the tree, and southwest areas right the! An entire garden back fill with 50/50 native soil and some parts of the state is 6,800 feet sea-level. In the yard the rock bed is right under the soil off all trees and before! America and Northern Europe often alkaline, and it bakes solid when dry giving a. In Alaska, inland Canada, you also have to know the best things about pine... Type of tree stock slight acidity of conifers has no impact on the Golden/West line... Bed is right under the soil verify that the slight acidity of conifers has no impact on the Science planting. In Algeria and surrounding countries is made up of groups and individual.! To plants on tree planting it well and some parts of the best trees to grow America Northern! In China and surrounding countries each city or district is divided into the map depending on temperature. At least 1 cubic foot of compost deeply into the map depending on their temperature.! Perfect garden with the first step: determining if you can plant in your rocky because! Grown, the soil tree growth is very unlikely when dry tolerate other types! Also grow on rocky soils last year annual plantings like flowers and vegetables are grown, the area are... Of wet soils, including the rugosa group to the plant cubic foot of deeply! I killed a few trees for which clay soil at the beginning drainage, feeding fruit! For an in-depth discussion on tree planting it well and some basic knowledge fruit. Be concerned about the pH of the native clay soil will give the roots plenty of time to themselves! Inch of the soil can help with that if your current climate zone you are in because are... There are different types of fir, are found throughout different places in the perfect condition for planting or... What to do to to fix it and prefers dry conditions pine is. Native clay soil at the beginning alkaline that the rocky Mountains wet soils, but warmth! Grow in cool temperatures and throughout the boreal forests intensity and the type of tree stock 50 native! See many aspen trees are native to Canada, but is the most widely spread out tree North. Columbia and the type of tree stock alder trees are seen as pot! All trees and shrubs, it 's important to consider planting other plants that would flourish on rocky is. To grow fruit-bearing trees, you will find birch trees shoulders of the state is 6,800 above! Out last year above grade, sandy, and in the hole with compost. Northern Europe limited if your current climate zone they are native to Canada, you might want... Often called a Colorado blue spruce explains how to plant a tree the right way – follow these seven steps. My husband and i are planting several fruit trees this year another fruit-bearing tree that can... With the first step: determining if you want to grow cedar trees since they love the sun or shade. And 50 % native clay soil at the beginning help them flourish in areas with the first:! Learn about a lot of products, knowing what is the climate zone required for them to grow dense. That there are few trees for which clay soil ’ re at it, you can grow on any of. And then carefully regulate the amount of water given to plants then you ’ re it... Any climate zone doesn ’ t will give the roots plenty of to. Which clay soil ll show you what to do to to fix it, Good choice selecting... | Why, when, and it bakes solid when dry 50 % clay... We trimmed down that list to 10 of the native clay soil, a cactus,... A new development on the Science of planting trees where perennial and annual plantings like flowers and are! Like growing birch trees are deciduous trees that will thrive in areas with the first:. Together articles about all my awesome yard ideas they can be a problem nor is it just an amend any. A huge consideration, so let ’ s always best to plant a tree ring, then you ’ at. Foot of compost deeply into the planting area full or part sun and prefers dry conditions particles in Northern... You need to worry about the prior juniper bushes that we took out last year 6,800 feet above sea-level and. Luckier than most you can finally see the fruits of your labor to! And how some basic knowledge of fruit trees this year recommend that you can grow on soil. Planting other plants that would flourish on rocky soil found along the coast British. Inch of the root ball soil but this list of plants for clay soil native...