Personally, like marquest, I would dig a hole and plant them outside. When frost kills the leaves, dig up the bulbs (which are actually rhizomes) and store until spring. It sounds like your plant may have produced so many new bulbs that the pot is too crowded with them. And if it's been a year, new soil is probably warranted. It may also need watering more often if the soil is becoming dry. They like to be moist. Make sure your fertilizer has a lower first number (the N - like 3-5-5 - just an example, this may or may not be a real fertilizer number) to make sure it doesn't get too busy making only leaves. This site which says they can bloom all year may be helpful or interesting. It sounds like the author is growing them outside in a very warm place, so I don't know if the advice there applies to potted plants up north.

Resurrecting an ancient thread! Recently a coworker left behind a canna lily. It was looking fine and had blooms - then we realized that the watering globe in it was stopped up and it hadn't been watered for a couple weeks, really. We gave it some water today and cut off the yellow and/or browned leaves. I think I'm the green thumb in the dept, but I'm not sure how to treat these. There's still a good deal of green leaves left on it so it looks OK with the sickly ones gone, but it seems very pot bound. I was going to get a larger pot and repot it - but should I water it? Fertilize for blooming? Let it go totally dormant? Or do the leaves stay all year if they're inside and watered and it'll just bloom when it wants to? Help!

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 !!