You can certainly plant the bulbs, but if these are spring bloomers, you won't have blooms this year. Starting your vegetables in the GH's is a smart move and is something I use one of my GH's for. It gives you that head-start when it is too cold to put them in the garden/pots. I have only put out my onion seedlings. I am waiting to put out my herbs, tomatoes, peppers, celery, and sweet potatoes. It looks like we will have one more good, solid freeze (27 F) and then that's it. I live in 8b.