I buy these wholesale, cut for flower arranging... try doing a search for Mini Call's.... That's what my supplier calls them. Hope you find some, there's some great colors out there! ~Dusty~

To be more specific and answer your question, after LAST frost I would put the pot outside. You are in zone 6 right? Keep in a sunny location, water well and after 1st frost follow previous advice. Here's what I include with bulbs I've given away or donated plant sales: Zantedeschia albomaculata: Calla Lily Form: Tender bulb. Exposure: Full Sun. Height: 24" (to 30" bloom). Spread: 18-24". Zone: 8-10. Flower Date: June-July. >Planting Reqs: Plant 4-8" deep and 18-24" apart when all danger of frost has passed (last week of May in ELong.). I plant those in back 4" deep and those in front 6-8" then cover all with 2" of compost/mulch. Fertilize using a 5-10-10 or 5-10-5 fertilizer. >Lifting Reqs: Lift the rhizomes after first frost, cut back stems, clean off excess soil, let dry out of the direct sun for a few days and then store in a dry location that remains between 50 and 60 degrees F. They can be divided before storage as long as the cut portions are allowed to dry. Doing so will prevent the open wounds from rotting. I use perlite in a PAPER bag. Check in late January. If rot is evident cut, scrape and clean off all rot. Coat cut surface liberally with powdered anti-fungal or cinnamon pushed firmly into flesh. Let dry and store. >Soil Reqs: Slightly acidic (6-6.5) well drained, humus enriched sandy loam. Adding mulch to the soil will help maintain a constant soil temperature. This will help keep the plant stress-free. Mulch will also improve the texture of the soil and help hold in valuable moisture. Calla lilies thrive in well-drained, loose soil. >Pruning: Remove spent flower stems to tidy up your plants and strengthen leaves and corm. >Note: Watch out for Japanese Beetles. Hope this helps. Evan

First, callas (Zantedeschia species) are not really lilies (true lilies = Lilium species) but arums, so you may get a better response posting in the Aroid forum. Second, I've never heard of anyone attempting to grow them hydroponically but theoretically I guess it could be done. The attached link has some info on growing them under lights (greenhouse conditions) but may be more appropraiet to potted plants. Here is a link that might be useful: callas under lights

Calla lilies are not true lilies but aroids. You might want to try posting this question in the Aroids forum to get some better information. Or, you could try Googling under the botanical name, Zantedeschia.