Conservation Volunteers. Get involved. Here are our top plants for clay soil. Everything you need to know about choosing the right rhododendron for you. Acid pH. It looks great among other rhododendrons, azaleas, pieris and Japanese maples. To grow them successfully you will need a soil pH value below 7. 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. Any clay soil will benefit from efforts to improve its texture. 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. Its ultimate height is 0.6m-1m. Discover rhododendrons. 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. Pay attention to the soil! This video is about the Soil Preparation for Rhododendrons in the Upper Midwest. Clay soil has its advantages – it’s very fertile, and it keeps plants well supplied with moisture. ... Popular Varieties of Rhododendron Grown in the UK. Soil: Moist but well-drained soil (clay, sand or loam). 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. It’s prone to waterlogging in winter and cracking in summer, but it’s also nutritious and moisture retentive. Most Southerners have either acid, clay soil or alkaline, clay soil. 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. (See Figure below.) Known as Rhododendron Inkarho, these plants have been developed from Rhododendrons found growing in a German lime quarry. We aim to enrich everyone’s life through plants, and make the UK … Clay soil can be heavy and hard to dig. Rhododendrons hate both, because clay drains slowly and roots rot. The revolutionary new "Inkarho" lime tolerant rootstock is particularly recommended for growing Rhododendrons on neutral clay soils, up to pH7. 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. However, it can be claggy in winter, and baked solid in summer, and only certain plants can survive these conditions. Growing & planting potatoes in clay soil. 2 “It produces toxins, and suppresses other plants by poisoning the soil as well as year-round shading.” Greenham & Crookham [West Berks.] It’s easy to grow, but the soil (clay, loam or sand) must be moist but well-drained, humus-rich and lime-free. The Royal Horticultural Society is the UK’s leading gardening charity. Discover rhododendrons. “Rhododendron poisons the soil around it so that other plants cannot grow.” Plantlife. 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