Pat during the winter everything gets a liquid fertilizer at least every two weeks, I can do this because we normally have very few freezing temps over the winter. Also those boxes and the beds have slow release and chicken litter tilled in before planting, and is also applied to the top after planting. Here the preparation before planting is more important than what's done after planting, I don't want them to slow down.
I have not noticed Pam's problem here.