Answer: In my experience these can be weeded out successfully by hand but it takes repeated efforts over a long time and you must be sure to remove the entire crown as well as any runners each time you weed. They can also be smothered under a heavy layer of newspaper topped with mulch. When they are entangled in the crown of a perennial however it is sometimes very difficult to remove them without digging up the perennial and carefully separating out the strawberry. This depends on which perennial it has entangled itslelf with. Where the strawberries are not touching a desirable plant, you might consider treating them individually with a herbicide containing glyphosate; be careful to read and follow the label instructions.
Q&A Library Searching Tips