Knock Outs are darn near bullet proof and grow prolifically. If you have the time and inclination .... pinching wilted blooms will help cause greater blooming. I prune as needed throughout the year and do a major one (to about waist high) in early spring. Followed by a fertilizing when freeze danger has passed.
I really like the Job's Organic Knock Out Rose Fertilizer. Smells like poop because it is mostly "chicken manure" ..... works great! 2-3 feeding per year is all they will need.
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