Tales From the Help Desk: Chickweed

Q:  I usually apply a pre-emergent herbicide in spring to kill chickweed.  Is it OK if I go ahead and apply the pre-emergent now? A. No. The use of a pre-emergent herbicide in winter would be ineffective because the weather is too cold for seeds to germinate. We tend to associate pre-emergents with spring because that is when we apply them to take care of crabgrass and other summer broadleaf weeds. I know for my lawn, applying pre-emergent herbicide is...