Knockout Roses - Knowledgebase Question

Montgomery, Te
Question by nschlottman
July 16, 2010
It seems I am always having a problem with my knockout roses. The leaves turn yellow and fall off. I only water them from the roots, not above. Any suggestions? I previously had petunias planted at the base and thought that may be a problem, so I pulled them out after they started to fade.


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Answer from NGA
July 16, 2010

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Knock Out Roses are usually quite vigorous and carefree so I'm not sure why you are having trouble with yours. As a rule they are disease resistant, grow best in all day sunshine, like to be watered deeply once or twice a week (depending upon weather), should be pruned back in the spring to promote new growth and appreciate being fed each spring. You might try feeding with a bloom booster type fertilizer and pruning your plants back a little to remove the yellowing leaves and to encourage new growth. If the leaves are yellow but the veins remain green, the problem is chlorosis and a dose of Ironite should help. Apply according to label directions. Hope this information is helpful.

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