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You prepare calla lilies for winter by lifting the rhizomes and storing them indoors before the first hard frost.
This simple process protects these tender beauties from freezing temperatures they simply can’t survive.
If you’ve been wondering how do you prepare calla lilies for winter, the good news is it only takes a few simple steps.
Getting calla lilies ready for winter isn’t complicated, and it’s the difference between enjoying them again next year or saying goodbye for good.
In this post, we’ll walk through exactly how you prepare calla lilies for winter, when to start, and the best storage methods.
Let’s dig in and get those gorgeous blooms safely through the cold months ahead.
Why Preparing Calla Lilies for Winter Is So Important
Calla lilies are not cold-hardy perennials in most growing zones.
If you live in USDA zones 8 through 10, you can leave them in the ground year-round without much worry.
But if you’re in colder zones, failing to prepare calla lilies for winter means the ground will freeze and turn those fleshy rhizomes to mush.
That’s why knowing how you prepare calla lilies for winter can save your entire flower bed.
1. Calla Lilies Are Tropical by Nature
Calla lilies originally come from South Africa, where winters are mild and frost never happens.
Because of this, they have zero natural defense against freezing soil.
When temperatures dip below freezing, the water inside their cells forms ice crystals.
Those crystals rupture the cell walls, turning firm rhizomes into soft, rotten messes.
So when you prepare calla lilies for winter, you’re essentially recreating their native warm environment during the cold months.
2. You Protect Next Year’s Blooms
The rhizome is where the plant stores all the energy for next season’s growth.
If you prepare calla lilies for winter properly, you preserve that stored energy.
And that means bigger, stronger plants and more abundant flowers when spring rolls around.
Skipping this step is a gamble that often results in dead plants and empty garden spaces.
Now let’s get into the actual steps so you know exactly how to do this.
The Best Time to Prepare Calla Lilies for Winter
Timing is everything when you prepare calla lilies for winter.
Wait too long and frost may already have damaged the rhizomes.
Start too early and the leaves haven’t had enough time to store energy.
1. Wait Until After the First Light Frost
A light frost that blackens the foliage is actually a good sign.
That’s nature’s way of telling you the plant is done for the season.
At this point, the leaves have already sent all their energy down to the rhizomes.
So when you prepare calla lilies for winter after a light frost, you’re harvesting fully charged storage units.
Just make sure you get them out before a hard freeze sinks deep into the soil.
2. Watch Your Local Forecast Closely
If a hard freeze is coming and your leaves are still green, don’t panic.
You can still lift the rhizomes early, leaves and all.
Simply cut the foliage back after digging and proceed with the normal storage routine.
The key is to get them out of the ground before deep cold penetrates.
So keep an eye on the forecast and plan your digging day accordingly.
Step-By-Step: How You Prepare Calla Lilies for Winter
Here’s the complete process from garden to storage.
Follow these steps carefully and your calla lilies will come through winter like champs.
1. Gently Dig Up the Rhizomes
Use a garden fork or spade to loosen the soil around each plant.
Start about six inches away from the base to avoid slicing into the rhizomes.
Lift the clumps out carefully and shake off the excess dirt.
Don’t wash them yet because wet rhizomes can rot during storage.
2. Let Them Cure for a Few Days
Spread the rhizomes out in a warm, dry, well-ventilated spot.
A garage, shed, or covered porch works perfectly for this.
Let them sit for about two to three days.
This curing step allows the skin to toughen up and any tiny cuts to seal over.
When you prepare calla lilies for winter, curing is one step you don’t want to skip.
3. Trim Away All the Foliage
After curing, cut off the dried leaves and stems with clean, sharp scissors.
Leave about one inch of stem attached to each rhizome.
This makes them easier to handle and removes any places where rot could start.
Then brush off any remaining soil but resist the urge to rinse them.
4. Inspect for Damage or Disease
Before storing, check each rhizome carefully.
Discard any that feel soft, look moldy, or show signs of rot.
One bad rhizome can spread decay to the others in storage.
Only healthy, firm rhizomes are worth keeping for next year.
Storage Methods for Calla Lilies in Winter
Once your rhizomes are clean, dry, and trimmed, it’s time to tuck them away.
The way you store them plays a huge role in how well they survive.
1. Use a Container With Good Airflow
Cardboard boxes, paper bags, or mesh bags all work well.
Avoid airtight plastic containers because trapped moisture leads to rot.
Place a layer of peat moss, vermiculite, or dry wood shavings in the bottom.
Set the rhizomes on top, then cover them with more dry material.
Make sure they’re not touching each other so air can circulate.
2. Keep Them in a Cool, Dark Space
The ideal storage temperature is between 45°F and 55°F (7°C to 13°C).
A basement, unheated garage, or cool closet works great.
Check on them every few weeks.
If any rhizome starts feeling soft or showing mold, remove it immediately.
3. Skip Watering While They Dormant
Stored calla lilies don’t need any water at all.
Moisture during dormancy is the fastest way to ruin your stash.
If the storage medium feels bone dry, that’s actually perfect.
Your job is to keep them dry, cool, and dark until spring arrives.
What About Calla Lilies in Pots and Warmer Climates?
Many gardeners grow calla lilies in containers, and that changes things slightly.
1. Potted Calla Lilies Can Stay Put
If your pots are in a spot that stays above freezing, you can simply move them indoors.
A garage or basement that doesn’t freeze is a perfect winter home.
Stop watering and let the foliage die back naturally.
In spring, bring the pots back out, start watering again, and watch them wake up.
2. Warmer Zones Can Leave Them in the Ground
If you live in zones 8 to 10, you don’t need to worry about lifting them at all.
Instead, you prepare calla lilies for winter by simply cutting back the foliage after it dies.
Add a thick layer of mulch over the planting area for extra insurance.
That’s all there is to it for those mild winter gardens.
So, How Do You Prepare Calla Lilies for Winter?
You prepare calla lilies for winter by lifting the rhizomes, curing them, trimming the foliage, and storing them in a cool, dry place.
For potted plants, just move them to a frost-free spot and let them rest.
For warmer zones, a good layer of mulch is all the protection they need.
Either way, the process is simple, takes very little time, and ensures your calla lilies come back stronger than ever.
So as the weather turns cool, take an afternoon and prepare your calla lilies for winter today.
Your future self, and next summer’s flowers, will definitely thank you.