Not all lawn weeds behave the same way. Some develop over the winter months then erupt into bloom as the weather warms.
Why clover keeps invading your lawn (and how to get rid of it).
It has happened to us all. We just can't imagine that the lovely little 2 foot shrub we brought home from the nursery will turn into a six-foot behemoth. Seemly overnight, it is blocking daylight or ...