Gardeners love Knock Out roses because they're some of the hardiest plants around. They transplant easily and they often survive the process without dropping their roses. And once in the ground, they grow with little attention. They only require intermittent fertilization and rarely need supplemental watering. In fact, its quite easy to over water Knock Out roses so its always a good idea to check the soil before you irrigate.
Soak your Knock Out rose's planting area to the depth of the rose's roots immediately after you transplant it into your garden. Keep a newly planted Knock Out rose's soil moist until it establishes itself and produces new growth.
Test an established Knock Out rose bush's soil once weekly to test its moisture level. Use your finger or a small trowel to dig into the top 4 to 6 inches of the soil. Only water when these top few inches of the soil are dry.
Use a hose or watering can to give your Knock Out roses roughly 2 inches of water early in the morning if the soil is dry. Do not wet the Knock Out rose's stem or foliage. This encourages disease and fungal growth.
Water your Knock Out roses with 3 inches of water the day before you apply fertilizer.