Our front lawn has always been plagued with dandelion-type weeds. Left to their own, they will grow a foot or so high. This year, they managed to get away from me, and suddenly the font yard was a sea of yellow. I cut them down with the lawnmower before they could go to seed. Lo and behold, they came back, this time flowering close to the ground, and very rapidly going to seed.

Clever little bastards!