Assuming they're indoors, start taking them out and exposing them to the real world, a little at a time . . . like an hour or two of morning sun, then maybe half an hour of hot afternoon sun, you know, just gradually introduce them to outdoor living, over a week at least, 10 days, little more time out every day til' they're totally outside. It's a common gardening technique. Obviously, don't let them dry out too much.
You'll know when they're ready.