Stem turning black and dying!!!

plantaddicttx(z7/8 TX DFW)July 1, 2009

My Knockout Rose is turning black at the base and dying! Over time, the black creeps up the stem until it kills that branch. What gives??? We're at a new house and double dug the bed. It's on a soaker hose.

The pictures with the pink background are the rose problems.

Here is a link that might be useful: See all my problems here

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jerijen(Zone 10)

I don't know about your area, but out here in SoCal, new housing is commonly surrounded by fill dirt from ???

I think an analysis of the soil might be in order.

Jeri

    Bookmark   July 1, 2009 at 10:55PM
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decobug(z6a Idaho SW)

I can't see the picture really well, but do you have mulch touching the canes?

    Bookmark   July 2, 2009 at 12:27AM
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diane_nj 6b/7a

And how often and how much are you watering? Roses need to be watered longer and less often, not for short periods every day. You can measure the amount by placing the soaker hose in a bucket and leaving it the time that you usually leave the soaker running.

    Bookmark   July 2, 2009 at 9:34AM
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plantaddicttx(z7/8 TX DFW)

I believe mulch does touch the canes (washes back after rain) My husband waters it every day on a soaker hose and timer. Bed was solid clay, double dug then replace with mix of local topsoil and potting mix.

    Bookmark   July 2, 2009 at 5:37PM
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catsrose(VA 6)

Another problem may bea late freeze. After a rose breaks winter dormancy and the juices start to flow, it can be very vulnerable to late freezes. The freeze can kill the cane but sometimes it takes weeks for the full damage to show.And, I am beginning to think, having a lot of rain just before such a freeze makes it worse, perhaps because the plant and/or its roots are holding more water which then freezes. A lot of people have experienced a lot of dieback, cankers and black canes this year. The weather patterns have been bizarre.

    Bookmark   July 2, 2009 at 8:25PM
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