Can I just add topsoil over clay?

When you add topsoil over clay, you exacerbate drainage issues rather than resolving them. Water now has a recharge point and will pool between layers, leading to root rot for the plants. I learned this lesson the hard way when I misapplied topsoil, creating areas of sogginess in my lawn. *Your method needs appropriate integration techniques so any stratification issues won't be problematic.

It's important to mix compost into the topsoil before you add it. Plants will transition through a zone for roots, and it helps develop a transition zone as roots cross layers. I personally use a broadfork to mix organic material into the soil without compacting it. If you mix the compost properly, plants can access nutrients in both layers.

You might consider raised beds as a quick fix. Build frames 8-12 inches high, filled with a good soil mixture. My vegetable garden in raised beds did well, and the native clay beneath was even better. The plants avoid any drainage issues immediately.

Over the next couple of weeks, observe the moisture levels after implementation. Use a soil probe to sample depths. I found that uneven moisture levels warranted extra compost amendments. Your adjustments will mitigate dry spots and over-saturated areas.

Soil structure continues to improve in the long term with continued amendment. After incorporating topsoil, continue adding organic matter annually. My integrated beds have drained well after three seasons. Your consistent care leads to permanent solutions for clay soil.

Read the full article: How to Improve Clay Soil: Essential Steps