Anyone grow these? My autumn clearup (yes, yes, I know, but better late than never) has revealed rather a lot of rooted runners from my tub of plants. Was given them last year & didn't get much of a crop off them as they were so small. Since the runners have rooted in the middle of the patio I'm not sure whether it's worth the effort of trying to get them out from between the slabs with roots intact, or whether to just treat them like all the other weeds & just drag them out. Can you actually get a decent crop off a few off them or do you need a whole field?