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Discussion id : 20-275
most recent 11 JUL 07 HIDE POSTS
Initial post 10 JUL 07 by Wendy C.
I've noted a number of new rosarians on HMF and thought I'd post some pictures of what heat can do to roses. We've had high 90's to low triple digits for nearly a week. And some of the roses look really ratty, while others don't seem to mind.

Leander has no color. The heat has taken my lovely apricot blend to white.
If you look at the edges of the spent blooms on Bridal Shower you'll see some browning. This isn't thrip damage, it's from the heat.
O'Rilla looks a mess with her petals all faded by the sun.
Cherry Parfait does pretty well, though if you look you'll see where the edges of the older blooms are crispy.
Double Delight is misshapen, though you can still tell it's Double Delight
All of this is normal with the onset of high temperatures. The good news? Some roses don't seem to notice, like Electra,Tahitian Sunset.
Keep your roses well hydrated, feed them and when the temperatures cool the roses will recover and give you a good flush.
Reply #1 of 7 posted 11 JUL 07 by Lyn G
Thank you, Wendy. We are experiencing triple digit temps, too and altho' I have been watering my roses daily, I did wonder about feeding them. I am quite content to wait until the weather is a lot cooler as I don't want to encourage new growth.

Reply #3 of 7 posted 11 JUL 07 by Wendy C.
In this zone I don't feed after August. In this heat, many won't grow any way. It is sort of like feeding granular in early Spring.. then it's there when they need it. If I were in the desert, I wouldn't feed until the temps cooled.
Reply #4 of 7 posted 11 JUL 07 by Lyn G

I want to prepare my roses better for winter this year by feeding them a rose food with zero nitorgen. I am looking to feed the plant and the root system and not add any new top growth to be destroyed by our mountain winter. I had planned to use this approach in October. Your zone is much, much colder than mine. Do you think this will help the roses over-winter more successfully ? I had more dieback this year than in previous years and I think it is because I cut back feeding too soon. So I am trying to develop a Plan B.

Reply #5 of 7 posted 11 JUL 07 by Wendy C.
Lyn, we all experienced more die back this year than normal. Did you experience the Easter freeze there? Mine were all just peachy until the freeze hit. blank stare, then it was a mess.

I don't think nitrogen is necessarily a bad thing, too much, well that is a problem. My soil is so well drained, and over abundance of anything isn't generally a worry.

This year, about 8-6 before growing season I put down granular lawn food. The rain worked it in and they have done pheonmenal all things considered. Perhaps that would be an option for you as well.
Reply #2 of 7 posted 11 JUL 07 by HMF Admin
This is GREAT! Exactly the of type experience we need added to HMF. Thank you again!
Reply #6 of 7 posted 11 JUL 07 by Cass
Wendy, how are you so lucky not to have thrips?!?!
Reply #7 of 7 posted 11 JUL 07 by Wendy C.
Oh I have them. Little blighters like to bite me when I'm dead heading. They don't seem to cause many problems though, when they do.. I spray.
Discussion id : 20-089
most recent 2 JUL 07 HIDE POSTS
Initial post 1 JUL 07 by John
What does it mean when the roses are sprouting red branches or canes? It looks like it will bloom but it just grows more and does not bloom. The roses are 8 years old and have bloomed perfectly for the last 8 years.
Reply #1 of 2 posted 1 JUL 07 by Cass
John, where is your garden? It is not unusual for new growth on roses to be richly colored - - reddish or burgundy are common. Not flowering, however, can indicate a numbers of problem, from too much shade and soil fertility problems to rare but serious insect infestations. If you garden in the eastern US, especially in Pennsylvania or Maryland, rose midge can prevent bloom and must be treated with potent pesticide. If you look at the growing tips and find that they are tiny and blackened, then rose midge may be to blame.
Reply #2 of 2 posted 2 JUL 07 by Wendy C.
What do the new canes look like? Are they thin and plentiful, in a bunch?

You either have new main canes/basil breaks which should be substancial and appear sturdy. Or the root stock is suckering. If the foliage doesn't match what you have, or it is coming up tiny it's the root stock. Dig down carefully to the bud union (nobby part where the canes come from) if the new growth is coming from under it, sharply yank down to remove them. Or if this the only growth, and you don't mind a once bloomer.. let it go.
It is probably either Multiflora or Dr. Huey
Discussion id : 19-708
most recent 20 JUN 07 HIDE POSTS
Initial post 19 JUN 07 by Charlene Tyma
I have about 15 rose bushes, all fragrant Hybrid tea roses. Last year was the first year I had some odd problems, and don't want to have them again this year. What are the symptoms of overwatering roses? Of underwatering? And what causes the tips of the petals of a rose to be dark? The bloom is large and very pretty except for the dark edges of the petals. It's almost as if the edges are rusty. No, the blooms are not supposed to have a different color on the edges. Even the buds have the brownish marks on them. It really looks like they're dying on the edges before they're even fully opened. Thank you for any help you can give me.
Reply #1 of 5 posted 19 JUN 07 by Judith C.
Underwatering, the buds don't open and the leaves dry up. Too much rain, the buds go brown on the outside and the petals stick, stopping the buds from opening. Overwatering (i.e. not with the rain), I wouldn't know ...
Reply #2 of 5 posted 19 JUN 07 by Wendy C.
Are these mostly light colored roses? Thrips will cause this damage. They are difficult to manage, but if you spray with a product for thrips and spray the just opening buds it should help.

On dark roses, hot weather will cause the edges to 'crisp'. That's what I call it because they get dark and very dry around the edge.
Reply #3 of 5 posted 19 JUN 07 by Charlene
Yes, it is a pink colored rose. Not pale, but a shade darker. And now the white rose petals are also 'crisp' around the edges. It has been brutally hot since May in our part of Virginia with only a few days here and there in the 70's. I've been trying to keep the roses from getting too dry by watering some every day. I figured they need it with these 90 plus degree days. But then I worried that I've overwatered! And soon the Japanese Beetles will arrive, and that's another story!
Reply #4 of 5 posted 20 JUN 07 by Judith C.
I just wanted to say that I never wet the leaves and flowers/buds when I water - just water the base of the plant - but maybe you do the same ...
Reply #5 of 5 posted 20 JUN 07 by Wendy C.
Mine are on a drip system and they still 'crisp' when the temps hover around 100 degrees
Discussion id : 18-299
most recent 27 APR 07 HIDE POSTS
Initial post 27 APR 07 by sdanet
I have been wintering this rosebush indoors and just put it outside recently since it was starting to get warmer in NY. The leaves were all green several days ago and yesterday I noticed that not only was the new growth red, but most of the existing leaves are starting to turn red. The rose is Crested Sweetheart and I can't find any pictures showing red leaves on the bush. Additionally, these leaves don't look right to me. I am uploading some pictures showing the leaves. Any idea of what might be the problem?
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