Thanks for your comments, Clint and Cindi. The tallest Knockouts n our Iowa gardens grow to about four feet. The difference may be in the climate. A longer growing season may well produce a taller rose.
When choosing a Knockout for potting, it is important to take into account the size of the container. The larger the container, the taller the rose can grow without seeming out of proportion to the other plants in the pot. Knockout roses--and roses in general-- should be pruned in spring. They will bloom for you yet that season, ofter with more blooms than if they hadn't been pruned. Here's a helpful site for pruning your Knockout:
http://www.conard-pyle.com/ind...
Note what the gardener in the video uses for a pruner. It's fast and it's effective. The old notion that one must prune carefully, just above a bud does not always hold true, especially with Knockouts. I would add one other pointer. Do get out your pruning shears if there is any dead wood in the bush and cut it out. Be sure to clean up all the debris when you're done.
