Answer: Roses do best in rather heavy soils (mostly clay) to which an abundance of organic matter has been added to loosen the texture and help moisture drain away. Well-rotted cow manure is THE BEST source of organic matter. To help the plants grow strong roots (and more flowers) apply 20% superphosphate at the rate of 3-4 pounds/100 square feet. Roses like a slightly acid soil with a pH between 6.0-6.8. For soils of average consistency, the pH can be raised 1 point by adding 5 pounds of ground limestone/100 square ft...to lower the pH 1/2-1 point, add 3 pounds of iron sulfate or 1/2 pound ground sulfur/100 square ft.
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