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I have a raspberry patch that is 3 ft X 50 ft. i have been fighting Canadian Thistle in this patch for 2 years (this is my third). All I have been doing so far is to keep popping the tops off with a dandelion weeder. Seems like every time I pop one off, 3 grow back.
This area has 4" of wood mulch over the top of the soil, but that doesn't seem to slow it down any. I don't want to use any "nasty chemicals" on them because they are very closely intermixed with my raspberries.
I was hoping the raspberries would get dense enough that the thistle would be choked out eventually, but that doesn't seem to be happening. Instead, the thistle just seems to grow taller faster.
At this point I am spending about 30 minutes almost every morning removing thistle (and getting poked half to death between the raspberries and the thistles).
Does anyone have any ideas how to control these effectively in a organic manner?
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