My tomato seedlings are out of the propagator and growing rapidly in
their 3" pots. They are almost three weeks from planting the seeds and
are almost 4" high and about the same wide. They are on their 5th true
leaf. Their next pots will be 5" pots which they will stay in until I
harden them off and get them ready to go outdoors.
How long should I leave them before repotting them into their 5" pots?