if its in a pot.. its in media ... not soil.. but if the leaves are showing.. they could be FROST/FREEZE ... you will have to wait.. or protect them on any given night ... as i asked.. how warm is mother earth??? ... an inch or two down ??? .. some bulbs dont mind a refrigerator.. others.. the more tropical.. might not ... i doubt you are going to get a specific answer.. because this is all about your little micro climate .... ken

Might be the variety. However, I'd go for more light (in easy stages to avoid sunburn) first. And perhaps ease back on the nitrogen feeds in favour of a balance, or more potash.

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

Hello All ! For Many Years I Thought Calla Lilies Were Indoor Only Plants, OK - I am Stupid, Well Maybe Non-Informed. They Just Look So Fragile And Ohhh So Beautiful ! I Saw Some At A Local Garden Center And Got (2) "Lemon Drops" & (1) Lavender. I Put Them In My Flower Bed And They Are Stunning ! I Want To Admire The Beauties All Day. I Am Located In Extreme Northwest Mississippi, (Zone 7B From What I could Figure) - OK It's Very Obvious I Am New To All This. My Mother Passed Away Last Year And I Inherited Her Home, Which I now Live In. She Was PICKY About Her Flower Beds & Lawn. In My Precious Mothers Honor I Am Trying My Best To Keep Everything Exceptionally Eye Catching. May I Ask Some Of You With Experience A Few Questions, Please? Will I Need To Dig Bulbs Up And Store At Winter Time In My Zone? (I Didn't Know What A Zone Was Until Today!) If So, May They Be Stored In Refrigerators Produce Compartment? Will The Beauties Multiply Over The Years To Come? Thank All Of You Very Much !!