Why is this rose struggling to wake up? Black spots on stems

11 days ago

I have this 3-year knockout rose tree-shaped. For some reason, it is waking up very slowly. It seems alive with few leaves. It might be due to the lack of full sun in spring time. I also noticed black spots on stems. Is this fungus? Should I wait couple more weeks or remove and replace it with something else?

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Moses, Pittsburgh, W. PA., zone 5/6, USA

10 days ago

last modified: 10 days ago

Omar, tree roses grown in the ground can be problematic in zone 6, my zone also. We are on the cusp of a 'cut off,' point for winter hardiness/winter dieback. Just one zone warmer, zone 7, and things change considerably, and zone 8 or greater generally have no winter hardiness/did back issues.

In our zone 6, the general rule is to grow tree roses in containers, and winterize them somewhere where it stays cold enough to keep them dormant all winter, like an unheated garage or shed. Still, it should be warm enough to prevent dieback.

What I would do now would remove the tree rose, pot it up, prune it back to live wood, and see if it recovers sufficiently to warrant saving further. Use a utility type pot, nothing fancy/pricey in case you decide to discard it if it does not revive nicely.

You may want to replant the empty spot with a nice ADR awarded rose.

May I advise you of the problems often associated with growing roses with a gravel mulch covering. Heat can build up incredibly during hot summer days severely stressing the roses. This is more important to note if you are in a warmer zone. As beautiful as the gravel/decorative stones look, they and roses are often a difficult combination.

BTW, the lawn is superb. I cannot imagine a more lush, rich green looking one.

Moses

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Comments (7)

jim1961 / Central Pennsylvania / Zone 6
10 days ago
I would replace that with something else that would grow best in that location...

If you want to try and grow a tree rose do like Moses said, in a large container...

Be careful when using rocks around roses as they could heat up & cause problems?
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Omar (Z6, Northwest Ohio)
Original Author
10 days ago
Moses. I have two more tree roses grown and they have been doing well. It is just one for some reason. Last winter was the milder winter we ever had in years in NW Ohio. My Bigleaf hydrangeas always die back to the ground every winter but they surprisingly survived this year.
Omar (Z6, Northwest Ohio)
Original Author
10 days ago
Moses. Glad you liked the lawn lol. I think you might be right regarding the rocks, even through there is fabric finder underneath it. I will probably replace it with a rose bush
Moses, Pittsburgh, W. PA., zone 5/6, USA
10 days ago
last modified: 10 days ago
With roses, there is often no rhyme nor reason why one rose, for example, does exceptionally well, while its identical variety neighbor limps along. I follow the Hippie Rule, "Go with the flow," when growing roses, even such ones as Knock Outs or ADR winners can present problems. Remember, we are not growing roses in Paradise. We have hot, humid summers which create A multitude of fungus issues, and there are the insect pests, plus spider mites. Finally, our winters can be brutal some years, killing roses essentially to the ground. So why bother? The beauty of a rose...like no other flower!

Moses
Moses, Pittsburgh, W. PA., zone 5/6, USA
10 days ago
last modified: 10 days ago
Omar, the gravel could be presenting no problems at all. I just brought it up for two reasons.

There have been posts on our Roses Forum of gardeners whose roses grew miserably under gravel mulched conditions. I recall those cases being in hotter zones, though. S

Second, I have a winter hardy cactus bed the same size as my rose bed, 8'x18'. It is munched with 3" of pea/shot gravel (the size of jelly beans). The cacti prosper in it, but hens and chicks, Sempervivums, just melt out except for the old standyby variety I call Jupiter for lack of a better name not knowing for sure since I got it as a gift. It struggles, but does not die out. Now hens and chicks are supposed to be rock solid succulents that should be able to take anything thrown at them...not so in my garden. The intense heat built up by the gravel does them in.

Moses
Sheila z8a Rogue Valley OR
10 days ago
Mmm in Colorado has great roses mulched in stones.

Why is this rose struggling to wake up? Black spots on stems

Moses, Pittsburgh, W. PA., zone 5/6, USA

Comments (7)

jim1961 / Central Pennsylvania / Zone 6

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Why is this rose struggling to wake up? Black spots on stems

Moses, Pittsburgh, W. PA., zone 5/6, USA

Comments (7)

jim1961 / Central Pennsylvania / Zone 6

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Omar (Z6, Northwest Ohio)Original Author

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Omar (Z6, Northwest Ohio)
Original Author

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