Suppose the soil is dry, water the hydrangea several times to soak the pot completely. It’s essential to water (but don’t soak) the plant daily when you first plant it, until it becomes established. Once you’ve determined what type of soil you have, you can more effectively prepare the soil for your hydrangea macrophylla. Growing Hydrangeas in Clay Soil If you have loam soil which contains approximately 20% clay (the rest is composed of sand 40% and silt 20%) then this is ideal for growing hydrangeas. Excess moisture will leak through the drainage holes. In the future, keep the soil always moist. It is not easy to grow in dense soil but this list of plants for clay soil will give you a fighting chance. They grow in a wide variety of soils, including heavy clay, but prefer well-drained soils. As mentioned above, clay soil absorbs and retains water. If you have a heavy clay soil, add gypsum to the soil to break up the clay and allow for drainage. Hydrangea. Well-drained soil is generally characterized by its ability to let water pass through it easily. Smooth and Panicle Hydrangeas – Some of the easiest hydrangeas to grow include smooth hydrangeas (H. arborescens) and panicle hydrangeas (H. paniculata). In areas with heavy clay soils, amend your site before planting. On the other hand, well-drained soil is great for cultivating hydrangeas. The ideal soil type for these plants is loam. Pennington Fast Acting Gypsum helps loosen compacted soil, improve water penetration and drainage, and correct soil conditions to allow for better root growth. Hydrangeas (Hydrangea macrophylla) are deciduous shrubs that produce large blooms. The flowers can be red, white, lavender and blue. You definitely don’t want the roots to dry out at this stage, but the clay soil should help with this. Hydrangeas prefer "well-drained soil that is rich in nutrients," McEnaney says, adding that heavy clay and sand-like soils aren't ideal for this plant. Soil – Excellent drainage is crucial to keep Limelight's roots healthy and free from rot. Hydrangea seemanii are happy in clay soil as long as it’s in shade. However, you can add gypsum to clay to aid with drainage, and peat moss or sand to allow for more water retention, he explains. https://homeguides.sfgate.com/preparing-hydrangea-soil-47416.html 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. Thus, it is not ideal for growing hydrangeas. Clay soils are naturally acidic, which will make the blooms on hydrangeas blue. There are flowering perennials, shrubs, climbers, and trees that all enjoy or tolerate hard clay … If you have clay soil, then take 50% compost and 50% clay soil and mix it. 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