UUG!,
I'll try to keep this short.lol
I made an experiment, soil less mix, and tested some seeds. I used hyacine vine seeds I got in a trade because I never saw one before and I thought they were germinatining. SO I potted some up in a south window. They're 7" tall and the mix is good. Bad news, I don't know if they are so tall so fast because of the variety, or lack of sun hours.
I'm a curious type, so I'll wait and see.
DO NOT put them outside. Not for perennial or annuals.
good luck.
hope this helps
:)Laura

It depends on what the seeds are, and how much light they will get. That is the way I always sow my tomato and pepper plants, in fact, any plants I start indoors under lights. But I don't do it until 6-8 weeks before last frost. They may not get enough light, and get leggy and not do well when they do go outdoors. I know exactly how you feel, but keep them and see how it goes. But don't be too disappointed if they don't thrive.

Laura, Hyacinth Bean is a very tall vine - will grow over the roof of your house - but they are usually very vigorous. They may survive until spring if they get enough liht.