Knockout Roses - Knowledgebase Question

Montgomery, Te
Avatar for nschlottman
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.

Answer from NGA
July 16, 2010
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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