In the greenhouse, never let the plants dry out
(the circling roots on the bottom of the pot are
very susceptible to stress!), and avoid forcing with
bottom heat. Studies in Holland showed that
plants grown on a solid surface where roots could
grow out of the pot and continue growth between
the bottom of the pot and the bench surface were
especially susceptible to infection. If necessary,
place crates on 1-2” diameter pipes (or other
crates)to elevate crates above the floor. The idea
being to allow quick and decisive “root pruning” of
roots as they exit the pot or crate. Similar precautions
should be taken if growing on substantially
closed benches.