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- Q.My Knockout Roses Leaves Are Turning Yellow And Falling Off - My knockout rose leaves are turning yellow and falling off. What do I do?
- Q.Knockout Roses Have Leaves With Areas That Look Discolored - These areas are not on the leaf but in it.
- Q.I Have 4 Knock Out Roses & The Leaves 1/2 Down Are Turning Brown - The bottom of the plants are bare with just stems. All the leaves turned brown and yellow and fell off. ...
- Q.Should I Continue To Feed My Knockout Rose Over Winter Months? - Should I continue to feed my knockout roses over winter months?
- Q.Pruning Knockouts/Do Or Don’t - First freeze has hit; still have blooms. . . do I prune my knockouts now or in spring? How much ...
- Q.Knock Out Roses Yellow Leaves - We have several Knock Out roses. They have some new growth but the old growth has yellowing leaves with black ...
- Q.What Is Wrong With My Knockout Roses? - Last year for the first time and now again this year, but worse, my Knockout rose bushes green and form ...
Asked by
shelby12 on
August 22, 2012Q.My Knockout Roses Leaves Are Turning Yellow and Falling Off
My knockout rose leaves are turning yellow and falling off. What do I do?
- Answered by
roseman on
August 23, 2012A.If it has been real hot where you are at, it is normal for the rosebushes to drop lots of leaves. It is an effort by them to get more air flowing through the rosebushes to help keep them cooler. If it has been real wet where you are, it could be too much water and the water is choking the oxygen out of the soils around the rosebushes. Once things dry up a bit they should improve in such a case. Here are a couple links to a couple articles I wrote on this subject. Please check them out and hopefully they will help you as well:
https://www.gardeningknowhow.com/ornamental/flowers/roses/leaves-falling-off-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm
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- Asked by
blackthumbTX on
August 25, 2012Q.Knockout Roses Have Leaves with Areas That Look Discolored
These areas are not on the leaf but in it.
- Answered by
roseman on
August 26, 2012A.I am not sure what you mean by discolored. However, it could be that the leaves are just turning towards yellow as they are soon to fall off. It could also be a fungus that is working on them. Here are a couple links to articles that you may find useful:
https://www.gardeningknowhow.com/ornamental/flowers/roses/black-spot-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/rose-bush-diseases.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/leaves-falling-off-roses.htm
These articles will give you some great information.
Was this answer useful?00 - Asked by
carolinaerin on
September 1, 2012Q.I have 4 knock out roses & the leaves 1/2 down are turning brown
The bottom of the plants are bare with just stems. All the leaves turned brown and yellow and fell off. Is this a fungus?
- Answered by
roseman on
September 2, 2012A.It couuld be a fungus but could also be the bush just going through a natural system of trying to keep itself cool in very hot weather. Not sure what your weather has been like but such actions can directly relate to climatic happenings where you live. Here are some articles that you should take a look at for some further good information:
https://www.gardeningknowhow.com/ornamental/flowers/roses/leaves-falling-off-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm
Was this answer useful?00 - Asked by
bluelily on
September 19, 2012Q.should i continue to feed my knockout rose over winter months?
Should I continue to feed my knockout roses over winter months?
- Answered by
roseman on
September 20, 2012A.No you do not want to feed the rosebushes over the winter months as they need the dormant time to rest up. Also if you are in a cold climate like I am, you do not want the rosebushes to be actively trying to grow when it gets real cold. It can kill them. I give my rosebushes a couple of tablespoons of superphosphate about now and mix it into the soils well. Then lightly water it in. It moves slowly through the soils and will give the root system something to feed on and keep strong over the winter, without promoting the upper growth. Here are a couple links to articles for you on this subject:
https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-winter-care.htm
and
https://www.gardeningknowhow.com/ornamental/flowers/roses/mounding-roses.htm
Was this answer useful?00 - Answered by
Stargazer on
September 19, 2012A.Hi bluelily,
I planted my first two knockout roses last spring and they are great! Good luck with yours though you won't need it. They're very easy. I fertilized my two bushes every 4-6 wks over the summer. I'll continue to feed them up to,
but before, the first frost. Then I'll quit feeding until spring. Hope this helps.
Have a great day! -StargazerWas this answer useful?00 - Asked by
hoboze on
November 17, 2012Q.Pruning Knockouts/Do or Don’t
First freeze has hit; still have blooms. . . do I prune my knockouts now or in spring? How much do I prune them? Can I control height and shape of bushes? Anything else to do for knockouts?
- Answered by
roseman on
November 17, 2012A.Here are some links to articles for you on this subject:
https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/prune-knockout-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/care-knockout-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/self-cleaning-roses.htm
You certainly can prune them to control their shape and size and they will bloom nicely all the same. If you have any further questions feel free to ask them either here or by sending an email in from one of the link sites above.
Was this answer useful?00 - Asked by
rosepedal on
March 11, 2013Q.Knock Out Roses Yellow Leaves
We have several Knock Out roses. They have some new growth but the old growth has yellowing leaves with black spots on them. What is this and is it a common problem? What should we do to remedy and keep it from reoccurring? Thank you!
- Answered by
AnnsGreeneHaus on
March 11, 2013A.This article should help: https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm
There is a search window at the beginning of this article. If you have more questions, enter a key word or phrase, and links to other articles will be available.
Was this answer useful?00 - Asked by
barbB on
May 1, 2013Q.What Is Wrong With My Knockout Roses?
Last year for the first time and now again this year, but worse, my Knockout rose bushes green and form buds beautifully only to have the leaves turn brown and almost transparent just before the blooms open. Last year they recovered to the point of looking decent over the summer and even bloomed but this year they look horrible! No research I have conducted even remotely describes this problem. I have pictures if needed. Help! Barb
- Answered by
roseman on
May 4, 2013A.I would recommend getting some fertilizer with a systemic insecticide in it and feeding your roses with that a couple of times about a month apart. Then switch over to a regular non-systemic rose food for the rest of the feedings. It sounds like you have either an insect or perhaps a rose slug problem when you say the foliage turns brown and nearly transparent.
Stan The Rose Man
Consulting Rosarian
Gardening Know HowWas this answer useful?00 - Answered by
kreg on
May 2, 2013A.there is a very,very small avid that may be eating the buds from the inside out.You might try seeweed and molases mixture. spray on plant.Plant absorbes the mixture and sends it throu out the plant therefore pumping it into the buds. good luck
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