knockout rose problem?

kpw212May 7, 2008

I don't know if this is a problem or not. I have a double knockout rose that I planted 10/06. Last year it looked terrific. This spring it's leafed out great, but now a bunch of the leaves are dried up and falling off. I live by Binghamton and last week we had a wicked frost. I'm wondering if its frost die back. I also have a climbing rose that's OK. I've fertilized the knockout and watered quite a bit. Any advice?

Also, has anyone heard that the organization who rates our zones have changed the zone designations? Supposedly my zone is now 6.

Thank you for reporting this comment. Undo
mad_gallica(zone 5 - eastern New York)

It sounds like canker. The canes have dead spots lower down that prevent water and nutrients from travelling up the canes. Above the dead spot, the cane has enough reserves of it's own to leaf out, but not enough to keep things going. The only thing to do is to cut it off below that spot. It's usually waay down, on the underside of the cane.

The 'new' zone map has been around for a couple of years now, I think. It's been discussed. The general consensus in the northeast seems to be that if you've already decided the old zones are too conservative, keep doing what you're doing. If not, again keep doing what you're doing. Personally for me, it doesn't matter whether I'm officially zone 5 or officially zone 6. I have to plant for zone 5 either way.

    Bookmark   May 8, 2008 at 11:56AM
Thank you for reporting this comment. Undo
penny1947(z6 WNY)

This article about Knockout Roses was posted on my forum and thought that it might be of some use to you since it does include growing info.
Penny

Here is a link that might be useful: Knock-Out Roses

    Bookmark   May 20, 2008 at 12:40AM
Sign Up to comment
More Discussions
Favorite Nursery in Capital Region
What's your favorite and why? Where is it located? I...
GardenMomma11
Anyone else growing the 8 foot tall Lily Trees/Bushes?
Planted some of the 8 foot tal lBreck's Lily Trees...
Oceanpeg
Help with ID this plant
We visited Rockport Maine in September and noticed...
p.polyxenes
Best farmers markets in Erie/Niagara?
While most of the posters and lurkers on this forum...
tomtuxman
Anyone Use New York State Nursery?
Anyone use the New York State Nursery? What were your...
edlincoln
© 2015 Houzz Inc. Houzz® The new way to design your home™