- 1). Select an area with well-drained soil that receives at least six hours of full sun during the day with some afternoon shade.
- 2). Test the pH level of the soil by conducting a soil test obtained from a nursery or the university extension in your county. Roses grow well in a pH range of 5.5 to 7.0. Amend the soil if necessary to establish an acceptable pH range. Refer to the test results, which will suggest what amendments to use. For example, for a soil testing of under 5.5, you would need to add 7 to 8 lbs. of dolomitic lime to every 100 square feet, according to Ohio State University Extension.
- 3). Add a 2- to 4- inch layer of organic matter, such as peat moss or manure. Mix in 3 lbs. of superphosphate per 100 square feet. Mix together with a shovel to a depth of 12 inches. This will provide nutrients for the roots.
- 4). Dig a hole 15 inches deep and 18 inches wide. Place the rose bush in the hole and backfill with soil firmly around the roots to alleviate any air pockets. Water well. Space the next purple rose bush 18 to 30 inches away to allow for growth.
- 5). Apply a 2-inch layer of mulch, such as pine needles, around the purple rose bush bed, leaving space around the main stem of the bushes.
- 6). Water the rose bushes 12 to 18 inches deep using a soaker hose at the base of the bush to avoid water splashing on the foliage, as recommended by Texas A&M University Extension.
- 7). Feed with a rose fertilizer once a month during their bloom season. Apply 1 cup of rose fertilizer sprinkling around the area but away from the stems. Water deeply to ensure the fertilizer does not burn the roots.
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