middleburg hts, Oh
|couple weeks ago transplanted 2knock-out roses. withered up,turned yellow, leaves fell off. you said to wait. now: standing up straight-some tiny growth on stems-but nothing else - found out spouse sprayed weed spray in garden when first transplanted!!should i cut back or still leave them go? also, what is your cure for aphids on roses? thanks so much
|Answer from NGA
June 20, 2010
|Depending upon which weed killer was used (some have residual qualities that can affect growth for a long time), your Knock Out Roses may eventually recover from the growth inhibitor in the weed killer. I'd just leave the plants alone and allow them to overcome the stress involved. When you see healthy new growth you'll know the roots have established well and the plants are strong enough to tolerate pruning. At that time you can cut them back to remove the distorted growth and encourage healthy new growth. Aphids love tender new growth and they are common pests of roses. A strong stream of water from the hose will knock them off the plants, or periodic sprays of insecticidal soap will control the pests. Insecticidal soaps contain fatty acids which can burn the tender rose leaves so I usually rinse it off after spraying. Insecticidal soaps will kill aphids on contact so hosing the product off won't lessen its effectiveness. I spray, wait a couple of minutes and then hose the product off the plants. Best wishes with your roses!
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