From when I've planted them in the past, they need a lot of sunlight, and they like it cool, especially at night. They are considered early bloomers in our zone (5), so if you're in Zone 7, you should leave them outside instead. Also, even if you've only got 2 leaves, they are probably busy growing roots. You've got a big basket to fill!

Put them outside. Alyssum is a cool weather plant. It will reseed outside here in zone 3. They do take a while though to grow into a decent sized plant. It will probably benifit from the cooler night temperatures outside. Don't worry about frost if you are still getting some. Allyssum does not freeze easily; it takes a very hard frost to kill them

Thanks a lot...started with bean and oilpainter,

I have kept the basket outside. Do u think - starting with few hrs/day and then proceed with whole day and night wud be ok?

Another question..I had put some 10-12 seeds and got good results - so, now there are 10 seedlings in that 14" basket with 2" space - wud that be too crowded when they all grow up big?

Thanks again

Yes that would be ok, but a better solution would be to set them outside in late afternoon and bring them in mid morning if that's possible. That is if you are not getting frost. Although Allyssum withstands frost these have been grown indoors. Next year put your basket outside in early spring and let them come up and grow out there.

That number of plants in that size container is plenty of room for Allyssum. They have a very small root system

Thanks a lot oilpainter...hope my alyssum come up nice. this is the first year I am starting from seeds.

will follow what ur advice for next year too..