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Robert Kourik cites the (literally) groundbreaking work of Weaver, a plant ecologist who advanced our understanding of root systems of native prairie plants, as an inspiration for his own studies. I shouldn't have been surprised, as Robert reproduced in Understanding Roots a drawing of the excavated root system of a 10-year-old horseradish that had penetrated more than 14 feet down into the soil. COLUMNS GROWING GREENER REPLAYING AN INTERVIEW with gardener extraordinaire Robert Kourik the other day reminded me of how little I - and most other gardeners, I think - know about roots, and how much he does know. [Extracted from the article]

We always recommend a soil test to determine the appropriate soil amendments, including compost, for your yard and your gardening goals. Adding too much compost can make the problem worse (remember, compost helps soils stay moist!). Depending on your compost mix, adding compost may not meet all the nutrient demands of your garden. [Extracted from the article]