Ask a Question forum: Knockout rose bush dying?

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Iowa
Lrenschrock
Jun 23, 2017 7:33 PM CST
We planted a knockout rose bush early this spring. About a month later it was loaded with roses. During that time a bug (a rose slug I think) came and ate every single leaf. The bush hasn't bloomed since and the stems are starting to turn brown. Its on the north side of our house so it really only gets morning sun. We have watered it well and just recently gave it fertilizer. Is there any hope? I'm not sure if it's dying or what to do.
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Name: Porkpal
Richmond, TX
Charter ATP Member I was one of the first 300 contributors to the plant database! Keeper of Poultry Farmer Roses Raises cows
Garden Ideas: Level 2 Celebrating Gardening: 2015 Plant Identifier
porkpal
Jun 23, 2017 8:22 PM CST
Cut off any dead canes, and wait. It will probably grow all new leaves soon. It isn't easy to kill a KnockOut.
Porkpal
springfield MO area (Zone 6a)
I was one of the first 300 contributors to the plant database! Plant Identifier
Frillylily
Jun 23, 2017 8:35 PM CST
well something is clearly eating holes all over the leaves. I would spray it with a mild sevin and see if that helps, maybe some kind of little inch worms? Since it has had to fight so much damage and re-growth, you may try fertilizing it. Roses use a lot of nutrients.
Name: Carol
Santa Ana, ca
Sunset zone 22, USDA zone 10 A.
Charter ATP Member Hummingbirder Lover of wildlife (Black bear badge) Orchids Region: California Plant Identifier
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ctcarol
Jun 23, 2017 8:36 PM CST
Lack of sun doesn't help either. I've only had rose slugs one season, and only on one bush, but boy can they do damage.
springfield MO area (Zone 6a)
I was one of the first 300 contributors to the plant database! Plant Identifier
Frillylily
Jun 23, 2017 8:38 PM CST
oh, I see now it is on the north side.
I doubt it will live on the north side of your house. They really need mostly sun. It will probably die, and will for sure not flower that way.
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jun 24, 2017 4:32 AM CST
Some roses bloom in cycles, a flush of blooms followed by a rest followed by more blooms. If the rose slugs haven't gone yet you could try insecticidal soap for them. It may not help much but deadhead the old flowers and cut back any canes that are actually dead (check by scraping the surface to see if they are still green inside). The north side of the house is not the best place for encouraging blooms. How many hours of sun do you think it gets?
Iowa
Lrenschrock
Jun 26, 2017 10:27 AM CST
sooby said:Some roses bloom in cycles, a flush of blooms followed by a rest followed by more blooms. If the rose slugs haven't gone yet you could try insecticidal soap for them. It may not help much but deadhead the old flowers and cut back any canes that are actually dead (check by scraping the surface to see if they are still green inside). The north side of the house is not the best place for encouraging blooms. How many hours of sun do you think it gets?


That's the frustrating part. We told the nursery we bought it from that it would only get morning sun and they said it was fine. I would say it gets about 4 maybe 5 hours. It did well to start with before the bugs got it, so I'm wondering if sun isn't so much the issue.

I will follow your suggestions. I just figured there would be new growth by now. It's been almost a month and there's no new leaves or buds. Perhaps I need to wait it out. Thanks to all for your input!
Name: Porkpal
Richmond, TX
Charter ATP Member I was one of the first 300 contributors to the plant database! Keeper of Poultry Farmer Roses Raises cows
Garden Ideas: Level 2 Celebrating Gardening: 2015 Plant Identifier
porkpal
Jun 26, 2017 2:13 PM CST
I have a couple of KnockOuts that get very little sun. They are not exactly thriving, but they bloom quite well, so I would agree that sun is probably not the issue.
Porkpal
Name: Lyn
Weaverville, California (Zone 8a)
Garden Ideas: Level 1 Garden Sages Celebrating Gardening: 2015
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RoseBlush1
Jun 26, 2017 7:12 PM CST
@Lrenschrock

Welcome to NGA.

You did get hit pretty hard by rose slugs, but roses are a whole lot tougher than we think they are.

When I saw your post, you sounded so discouraged I had to go out and take some photos of my roses so that I might give you some hope.

I had a severe rose slug infestation in my garden this year.

Many of my roses were totally defoliated by the dang critters. This is what severe saw fly slug damage looks like:

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On Sunday, triple digit temps hit my area and the slugs were gone ....

All I have done to help the roses get through the heat was wash the roses down daily and water. I deep watered them today and will feed them tomorrow since temps have dropped a bit.

Every rose has put on new foliage at its own pace. I haven't found any dead wood on any of the roses.

This is a photo of the new foliage put on by the same rose that is in the photo above

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This rose did not have one viable leaf last Saturday

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None of the roses will die. They are all coming back just fine. Based on my experience, I think your rose will come back, too.
I'd rather weed than dust ... the weeds stay gone longer.
springfield MO area (Zone 6a)
I was one of the first 300 contributors to the plant database! Plant Identifier
Frillylily
Jun 26, 2017 8:47 PM CST
I have two pink knockouts planted on the south side of my house and the one gets full sun all day, and the other does not get any sun on it until about noon or 1. It is smaller than the other and blooms heavier on the side that is toward the sun (west). In my experience roses do best with full sun. It may do ok on the north side with 4 or 5 hours of sun though. Most of my north side gets practically no sun at all. I think though that if you really want it to thrive, more sun would be better. Once they are defoliated really bad, it can take quite a while for it to come back. A little boost of fertilizer will help it along I bet.

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