Answer: You'll want to amend your clay soil with lots of compost to improve the drainage. Plant soon after the last possible frost date to allow root systems plenty of time to get established before the heat of summer.
Water the rose thoroughly the day before. Dig a hole that is twice as wide as the root ball and the same depth. Mix a phosphorous source, such as bone meal, to promote bloom into the bottom of the hole. Mix plenty of organic matter, such as compost and peat moss, to the backfill. Set the root ball in the hole and fill around it. Ensure that the rootball is planted level, or a little higher to allow for sinkage, with its depth in the original container. Water thoroughly and keep soil moist, but not wet, until root systems can establish.
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