(See Figure below.) It looks great among other rhododendrons, azaleas, pieris and Japanese maples. 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. Everything you need to know about choosing the right rhododendron for you. We aim to enrich everyone’s life through plants, and make the UK … Heavy clay soils collect and retain water so it is recommended to plant rhododendrons and azaleas above the base clay soil in a mound of desirable soil. Here are our top plants for clay soil. Clay soil has its advantages – it’s very fertile, and it keeps plants well supplied with moisture. However, it can be claggy in winter, and baked solid in summer, and only certain plants can survive these conditions. Advertisement. Rhododendrons hate both, because clay drains slowly and roots rot. This patented rootstock was developed from a Rhododendron growing in a German lime quarry, and has been the subject of an extensive 20 year breeding and testing programme. Rhododendrons need moist, acid, loose, well-drained soil that contains a good bit of organic matter. The Royal Horticultural Society is the UK’s leading gardening charity. Known as Rhododendron Inkarho, these plants have been developed from Rhododendrons found growing in a German lime quarry. This video is about the Soil Preparation for Rhododendrons in the Upper Midwest. Autumn is best,when the soil is still warm, but the plant isn’t in full active growth.The second best time is in early autumn as the soil starts to warm up again. To grow them successfully you will need a soil pH value below 7. Conservation Volunteers. ... Popular Varieties of Rhododendron Grown in the UK. How potatoes can help condition your clay soil 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. ... Nearly all rhododendrons need acid soil. Its ultimate height is 0.6m-1m. Any clay soil will benefit from efforts to improve its texture. It’s far better to grow plants that thrive in clay soil and the good news is that there are some great plants to choose from. Soil: Moist but well-drained soil (clay, sand or loam). Discover rhododendrons. Get involved. Discover rhododendrons. If you dig a hole in heavy soil and fill it back with a light soil mixture, you may be creating a bucket which will hold significant water. The revolutionary new "Inkarho" lime tolerant rootstock is particularly recommended for growing Rhododendrons on neutral clay soils, up to pH7. Acid pH. It’s easy to grow, but the soil (clay, loam or sand) must be moist but well-drained, humus-rich and lime-free. 2 “It produces toxins, and suppresses other plants by poisoning the soil as well as year-round shading.” Greenham & Crookham [West Berks.] Most Southerners have either acid, clay soil or alkaline, clay soil. This is why they're hard to grow here. “Rhododendron poisons the soil around it so that other plants cannot grow.” Plantlife. This video is about the Soil Preparation for Rhododendrons in the Upper Midwest. It prefers a cool position and doesn’t love full shade, but will be perfectly happy in part-shade. Clay soil can be heavy and hard to dig. Growing & planting potatoes in clay soil. If you are unsure of your soil pH level then use a pH soil testing kit, available from most garden centres. It’s prone to waterlogging in winter and cracking in summer, but it’s also nutritious and moisture retentive. Pay attention to the soil! 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