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Seems like I am always behind pulling out all the grass and weeds out from house plant pots. How about using Preen? I'm, of course, thinking plants that do not sucker or put out off shoots. My understanding was that Preen prevents seed germination, yes?
Preen (regular version or organic version) won't hurt plants, suckers, etc--all it does is prevent seed germination. If you're going to use it in containers though make sure you read the instructions on amount to apply per square ft/etc...in a garden bed I don't think there's much chance that you'd apply too much, but in a pot that would be a bigger concern. I'm not sure if accidentally using a huge excess of it (especially the non-organic Preen) might have some negative effects.