Posted: 06/04/2015 at 07:27
Lucy, all 3 varieties are indeterminates, meaning they will need staking further down the track.
At this point all they need is as much light (preferably natural sunlight) as possible and some reasonable warmth. The aim is to let them develop under their own steam, building up their strength for the season ahead.
Take them out of the propagator. Water them only when necessary. The mix must not be permanently damp. It should be allowed to dry out between waterings. Toms are very sturdy things and shouldn't be mollycoddled.
If you have daytime temps into double figures, put them outside in a sunny spot, moving them to catch the sun if necessary. Bring them inside at night if the temps drop overnight. If your dayime temps are lower, put them on a tray or into a small crate and cover them with something like bubblewrap which will keep them warm while letting in any available sun.
My seedlings live in 3" pots until they're ready to plant out. They're ready to plant out when they reach around 6" in height though obviously the timing depends on (a) your temperatures; and (b) where you're going to grow them.
You don't need to worry about staking till they're planted out. In good growing conditions expect the plants to grow up to 6', though the Green Zebra will likely be a bit more compact.