Lawn full of dandelions. I used a lawn weedkiller which is supposed to finish them off, and I'm sure I did the right quantities etc. However, it's not budging the things, 10 days ago now and they look unhealthy, but not sufficiently dead. I thought to give it another treatment but on re-reading the bottle it says use no more than once a year!
does it normally take so long to kill them off?