Easy to control in grasses with a broadleaf specific herbicide, like 2-4D. You could always site them where you can mow on either side of a row of them. I have both in my garden, and they do try to spread by rhizomes, but since I mow around them every week or so in the summer, they haven gotten away from me in ten years. I do sometimes dig up spring sprouts to establish new plants, and I’ve had good luck lengthening by blackberry bed by layering the canes.
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