I lived the Gardeners Proverb: One year seed equals seven years of weeds and I spent every weekend and most evenings after work working on the weeds. After 6 or 7 years of diligent weeding the little flower beds in our shrub beds; I only had flowers reseeding themselves
... but then we moved here and rented the house out 2½ years ago. My DIL drove to the house recently and found that the flower beds look like they need mowing