knock-out roses

My knock-out rose bush is getting leggy; is there a specific height they should be pruned to? It blooms consistently but often produces browning leaves. What causes the browning leaves?
Thank you for your assistance.

Esme

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1 Comment To "knock-out roses"

#1 Comment By roseman On 01/16/2016 @ 3:35 pm

I like to keep my Knockouts to 30 inches in height or less (24 inches). Browning of the leaves can be caused by sun reflection burn,can be just a normal process by the bush to eliminate some foliage when it gets too full and the temps outside are high. Getting leggy can be just the shedding of foliage in an effort to keep cooler when it gets real hot out. You could try doing some thinning pruning so that the bush is not quite as full.

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