Whether Sweet William will grow inside..answered my own question!!

Question

Brought a small Sweet William in from the garden as it was to turn very cold. Planted it in a small goldfish bowl with gravel in the bottom, and sat it on the sunny kitchen windowsill. Lo and behold, now have 8 fringed blooms in pink/white. Even put a worm in the bowl and can watch it. May try with one of the yellow pansies. . . fun to do!!

Answer 1

Sweet William, as with most Dianthus plants, are ideal for containers, so with the proper growing conditions, they should do fine indoors. Glad you are having luck with yours!