When the temperature drops below freezing, planting must be stopped and the stock heeled in or otherwise protected.
(the temperature; drops; below freezing) (planting; must be stopped; T:When the temperature drops below freezing) (the stock; heeled; L:in or otherwise protected)
the temperature planting the stock
drops must be stopped heeled
below freezing
T:When the temperature drops below freezing
L:in or otherwise protected