Answer: Cactus must have well-drained soil that is loosened to a depth of about 12 inches. Cactus do not have deep root systems as they have adapted to our limited rainfall by having shallow roots that can soak up limited rainfall. Their roots will rot in wet soil. Most desert soils don't need any additives because cactus have adapted to thrive in alkaline, rocky soils. No fertilizers or organic matter is needed. If you live where there is heavy clay soil that stays moist, you might want to incorporate gravel to improve drainage. Good luck with your cactus garden!
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