Question: I have clay soil. How can I loosen it up so plants’ roots can grow?

Answer: Organic matter will help break up tight clay soils. Rototill to blend several inches of Canadian peat moss, well rotted compost, finely shredded bark mulch and rotted manure, among other sources of organic matter, into the soil. As the organic matter breaks down it will act to loosen the clay. You’ll need to supplement with fresh organic matter every year or two. You can also include a very thin layer (1/2- to 1 inch) of washed brick sand or preferably expanded shale, but only in combination with the organic matter.