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Here in Laguna Woods, California z9 roses start in SEPTEMBER in every yard to get something like Botrytis across our small city. The terminal ends of all canes blacken and produce nothing, yet the blackening does not continue down the canes. This happens in sprinkler areas and non sprinkler areas. Cutting back on the canes produces spindly growth that will need to be pruned in DEC/JAN. So the last flush of late summer is never full or satisfying. What is it?
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In my garden I call this sort of dieback the Black Death! It often halts for a while at a vigorous bud, but the long term prognosis for the cane is not good. The only advice I can offer is to look to your nutritional practices.
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