Lavender seedlings, advice needed please

Hi all earlier this year thought I'd try my hand at propergating seeds, one of the plants I have tried is lavender. They germinated very well and I now have 120 lavender seedlings! I re-potted them in the last few days as the roots were very big for the size of the plants and today moved them from my window sill into a greenhouse. Does anyone have any advice on how to care for them from now? Do I need them? Also when can they go outdoors? Any advice would be greatly appriciated as I am quite a novice when it comes to gardening.
Thanks Caroline

 

Welcome to Gardeners Corner Caroline

You can harden them off by having them outside during the day, but bring them back in at night for 2 weeks. They'll be ready to plant out after that.