Oh Vik, we've had the same dilemma with our lottie. I'm all for being organic but after reading a load of threads on this site I came to the conclusion that as I couldn't guarantee the previous owner hadn't used chemicals and I'm fairly sure the guy next to me does I went for the round-up. Sure I read somewhere on here that according to the Soil Association it takes at least two years before you can be classed as organic anyway so one more application won't hurt! Once the ground is cleared I'm definitely going to try not to use chemicals though. Might mean I don't win the annual pumpkin competition though!