Hey
Growing your seedlings in a Onion bag has worked well since u can plant straight into ground without shocking the plants the roots will grow right through, also the bigger the seedlings the better without becoming a hassell to transport, maybe a foot high? atleast they will be a bit hardier. bring slug pellets and fertiliser sticks they slowy release nitrogen into the soil over a few week period. Goodluck u might get away with visiting them only once a month but definatley bring everything with you encase u come across a problem you dont wanna be driving home to pick up water crystals or lime.