I grow outside all the time 5yrs. I just start inside till the're about 6" then put in a slightly
larger pot exposing them to a little outside temps from morning to night then bring them inside. A couble of weeks later I keep them outside for good.. Just make sure there's no late season frost as this may stunt your plant And keep in soil with good drainage as if it gets cool the pot won't be soaked with water hence possible frosting ( not, freezing ) when weather co-operates then into larger pots, I find this gets your plants accustonized to the varities of outside weather. Good in the great white north to get your plants aclimatized to our changeing temps
Good Luck