Posted: 06/06/2013 at 20:22
You didn't hardening them off first, probably.
I put plants into a coldframe for 2 weeks, after the greenhouse. This allows enough time for the plant to get used to the cold.
You'd be pretty shocked if you jumped into the north sea, yes ? same goes for plants.
Hardening off is the key, even in June. Only time will tell, which plants are the strongest.