Here is my problem. I took this landscaping job this year, really simple. Edge the beds, weed the beds, trim the shrubs and trees on property and apply 10 yards of mulch. I treated the beds with round-up, cleared the beds of weeds and now (3 weeks later), you can't even tell that I was out there. Another company has the mowing account for this property (friend of mine) and he called me and made me aware of the situatuation. I went out tonight and was totally amazed. Thistles all over the place. It's like the fricken mulch just fertilized them and they're coming back in full force. This is a decent paying job for the hours, $1,500 and I need to get this fixed at no cost to them like....now. My question is, what is the best route for me to take. Round-up is not getting the job done. Please help.