Hi folks, I didn't top my field last year and the thistles are extraordinary this year as a result. I'm just about to top it but I can't get to the bottom of whether I should remove the tops from the field, or let them lie. It's just under an acre and there are 3 sheep on it. Will leaving the tops on the field stop them from spreading? Are three sheep enough to eat the tops all up? They are almost in flower. I'll let the insects get the flowers then go for it, I think. I have a blade attachment for my petrol strimmer so planning to use that. Any advice much appreciated. X