One extra step I do for them inside is that I pinch out any spent blooms as I come across them during weekly waterings. This seems to encourage more and longer flowering from the plants.
This year, rather than compost these sweet little plants, why not plant them out in your garden and be rewarded with blooms for years to come?
All who are involved with You Can Grow That! (YCGT!) believe that plants and gardening enhance our quality of life. We want people to be successful with what they grow and to become more aware of the many gifts that horticulture brings. Find out more at http://www.youcangrowthat.com/.