Answer: Fertilization should ideally be based on a soil test. Depending on the levels of various nutrients in your rose growing beds the best fertilization recommendations for pre-planting will vary. Your County Extension Office can assist you with having your soil tested. Their number is 407-233-1712.
Start with plenty of compost mixed into the soil. This will benefit the plant in many ways including providing better nutrient holding ability in a sandy soil. And better soil structure and improved aeration in a clay soil.
As a "rule of thumb" you can add 1/4 to 1/2 cup of a complete fertilizer per square yard of bed area. Then when planting the rose bush, mix 1/4 cup of bone meal or super phosphate into the soil in the bottom of the planting hole.
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