Why do the leaves fall off my knockout roses?
There are several reasons this happens. Here is a link to an article on this subject that I wrote. Please check it out and let me know if you have further questions. Link >> https://www.gardeningknowhow.com/ornamental/flowers/roses/leaves-falling-off-roses.htm
I have a flower bed about 8 feet long. It does not have anything yet. I want to grow knockout roses there. I am not sure if I should wait for spring or can I grow knockout roses at the end of September? I live in Houston, TX. Kindly reply back. Thanks Kay
Yes you can but be sure to water them in with some super thrive and root stimulator in the water. Spring is truly always best but it can be done this late in your area. Be very sure to keep a close eye on the soils moisture over the winter months. Here is an article for you to check out on this too:
https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-winter-care.htm
The leaves have tiny holes in them. Is something eating them? What can I do?
The tiny holes are likely caused by some small beetles that poke holes in the leaves to such out juices for their survival. Spraying the roses with a good insecticide should take care of the problem, use the least harsh insecticide first, like a Safer brand and move up if need be. The holes will not disappear but should stop being present.
Owner would like them to be pruned back so the plants (9) are all the same height.
You can certainly do this, however the owner will sacrifice many blooms by doing so. If pruning them back to the same height is only a light pruning on most of them, then it will probably work out okay. Just be sure to let them know about the blooms reduction if they are pruned back heavily.
Do the knockout roses come back or do I have to replant each year?
Knockouts are hardy rosebushes and will usually come back well each year. You will likely need to prune out some of the dead canes each spring but otherwise they should do fine. Be sure to wait for the bushes to start to leaf out before pruning what you think is dead as sometimes it is not.
I live in eastern Canada, Atlantic provinces.
I do not personally know if the Knockout line of roses is available in your area, if not, you might try looking for the Homerun family of roses, or one named Winnipeg Parks for a rosebush that is very similar to the Knockout but said to be a better bush by some. Here is a link to a company in Canada that should be able to help you: https://palatineroses.com/
I bought two cherry red bushes this past spring at Costco. I planted them in good soil, in a sunny spot. They are very healthy and disease-free - no small feat here in humid Baltimore. However, they only have, at most, one or two blooms. What gives? jane
There are a few reasons why any rosebush may not bloom well or at all. We need to be sure their root zone is happy in their new home and 9 times out of 10 the top part will follow along happily. Here is a link to an article that should be helpful to you: https://www.gardeningknowhow.com/ornamental/flowers/roses/no-blooms-on-roses.htm