Hi Anita -- what kind of annuals do you have started, and how big are they now, and when were they planted? Are they under lights, or ? What did you use for a growing medium -- I haven't had very good luck using things that were supposed to be specifically for seed starting, so maybe your plants just need some fertilizer. (I usually start using a dilute Miracle Gro on my seedlings when they have a couple of sets of true leaves, really very dilute, just a light blue color) The annuals I start - mainly petunias, marigolds, impatiens - seem to get pretty overgrown even in the smaller 6-packs if I don't get around to potting them up, so I'm not sure that a larger pot is going to spur yours into growing bigger. And I think an enclosure like a ws jug or aquarium might be *too* humid and lead to mildew or damping off. So many variables.... but then, the uncertainty seems to hold some sort of attraction to us, doesn't it !! I hope we all have a good gardening season this year!