Your Cool Home is supported by its readers. Please assume all links are affiliate links. If you purchase something from one of our links, we make a small commission from Amazon. Thank you!
You can look after calla lilies outdoors by giving them consistent moisture, well-draining soil, and a spot with bright indirect light or partial shade.
Caring for calla lilies outdoors isn’t complicated, but it does require understanding their native preferences for damp, warm conditions.
If you’ve been wondering how to look after calla lilies outdoors so they bloom year after year, this guide covers everything from planting depth to winter care.
In this post, we’ll walk through the best practices for outdoor calla lily care, including watering, feeding, and dealing with common pests.
Let’s dig in and make sure your outdoor calla lilies thrive.
How to Look After Calla Lilies Outdoors: The Essentials
The core of how to look after calla lilies outdoors comes down to mimicking their natural habitat along stream banks and marshy areas.
These plants love moisture, but they hate sitting in soggy, waterlogged soil.
So the first rule for outdoor calla lily care is to find that sweet spot between consistently damp and perfectly drained.
1. Choose the Right Planting Location
When you’re figuring out how to look after calla lilies outdoors, the location you pick does half the work for you.
Calla lilies outdoors need full sun in cooler climates, but they’ll appreciate afternoon shade in hotter regions.
If you live in a zone that gets scorching summer afternoons, a spot with morning sun and dappled afternoon shade is ideal.
This protects the leaves from burning while still giving the plant enough light to produce those gorgeous trumpet-shaped blooms.
Also, think about wind exposure because tall calla lily stems can snap in strong gusts.
A sheltered spot near a fence or a larger plant works beautifully.
2. Get the Soil Right for Outdoor Calla Lily Care
Soil is where most people make a mistake when it comes to how to look after calla lilies outdoors.
These plants prefer rich, loamy soil that holds moisture without becoming a swamp.
Before planting, mix in plenty of compost or aged manure to boost organic matter.
If your soil is heavy clay, amend it with coarse sand or perlite to improve drainage.
If your soil is sandy and dries out too fast, add extra compost to help retain that moisture calla lilies crave.
A slightly acidic to neutral pH, around 6.0 to 7.0, is the sweet spot for outdoor calla lily care.
3. Watering Strategies for Calla Lilies Outdoors
Watering is the most critical part of learning how to look after calla lilies outdoors.
During the growing season, you want to keep the soil consistently moist, never bone dry and never waterlogged.
A good rule of thumb is to water deeply once or twice a week, depending on rainfall and temperature.
In the heat of summer, you might need to water more frequently, especially if your calla lilies are in containers or in a windy spot.
Mulching around the base of the plant helps lock in soil moisture and keeps the roots cool.
Just make sure the mulch doesn’t touch the stems directly, as that can encourage rot.
4. Feeding Your Outdoor Calla Lilies
Fertilizing is another key piece of the puzzle for how to look after calla lilies outdoors.
These are hungry plants that benefit from regular feeding during the active growing season.
Start by mixing a slow-release balanced fertilizer into the soil at planting time.
Then, once the plants are actively growing, feed them every four to six weeks with a liquid fertilizer high in phosphorus.
Phosphorus promotes blooming, so look for a formula with a higher middle number, like a 5-10-10 or similar.
Avoid high-nitrogen fertilizers because they’ll give you lush green leaves but very few flowers.
That’s a classic mistake in outdoor calla lily care that leaves gardeners scratching their heads.
Seasonal Care: How to Look After Calla Lilies Outdoors Year-Round
Outdoor calla lily care isn’t a one-time task; it changes with the seasons.
Understanding the yearly cycle is essential if you want to know how to look after calla lilies outdoors for years to come.
1. Spring Planting and Growth
In spring, plant your calla lily rhizomes after the last frost has passed.
Plant them about 4 to 6 inches deep with the pointed end facing up.
Space them roughly 12 inches apart to allow for airflow and growth.
As soon as the soil warms up, you’ll see shoots emerge within a few weeks.
During this time, keep the soil evenly moist but don’t overwater while they’re sprouting.
2. Summer Blooming and Maintenance
Summer is when your calla lilies outdoors will shine with their elegant, funnel-shaped blooms.
Keep up with regular watering and deadhead spent flowers to encourage more blooms.
Deadheading simply means cutting the flower stem down to the base once it starts to fade.
This redirects the plant’s energy into producing new flowers instead of setting seed.
Also, watch for yellowing leaves, which can signal overwatering or a nutrient deficiency.
3. Fall and Winter Prep for Outdoor Calla Lily Care
Fall is the time to start thinking about winterizing your calla lilies outdoors.
If you live in USDA zones 8 and warmer, your calla lilies can stay in the ground year-round.
Just cut back the foliage after it dies back and add a thick layer of mulch for winter protection.
If you’re in a colder zone, you’ll need to dig up the rhizomes before the first hard frost.
Carefully lift them with a fork, brush off the soil, and let them dry in a warm, airy place for a few days.
Then store the rhizomes in a box filled with peat moss or sawdust in a cool, dark spot around 50°F.
This winter storage step is absolutely vital for how to look after calla lilies outdoors in northern climates.
Common Problems and Solutions in Outdoor Calla Lily Care
Even with great care, you might run into a few issues when figuring out how to look after calla lilies outdoors.
The good news is that most problems are easy to fix if you catch them early.
1. Dealing with Pests
Aphids and spider mites are the most common pests that bother calla lilies outdoors.
You’ll often find aphids clustered on new growth and buds, sucking the sap and weakening the plant.
A strong spray of water from your hose can dislodge them, or you can use insecticidal soap.
Spider mites thrive in hot, dry conditions, so keeping the humidity up around your plants helps.
If you see fine webbing on the undersides of leaves, treat with neem oil.
2. Managing Diseases and Rot
Root rot is the biggest killer of calla lilies outdoors, and it’s almost always caused by poor drainage.
If your plant’s leaves turn yellow and mushy, and the stems soften, you probably have root rot.
To fix this, you need to improve drainage immediately and cut back on watering.
Bacterial soft rot can also occur, especially if the rhizomes are damaged or stored improperly.
Powdery mildew can appear if the air circulation is poor, so make sure your plants aren’t overcrowded.
3. Why Your Calla Lilies Aren’t Blooming
If your calla lilies outdoors aren’t blooming, it’s usually one of three things.
Not enough sunlight is the most common culprit, so check if something is shading them too much.
Too much nitrogen in the soil is another cause, as we mentioned earlier.
Finally, if the rhizomes are planted too deep, they may focus on producing foliage instead of flowers.
Make sure the top of the rhizome is only about 4 to 6 inches below the soil surface.
So, How Do You Look After Calla Lilies Outdoors?
You can look after calla lilies outdoors by focusing on consistent moisture, great drainage, and seasonal care.
The key is to give them rich soil, regular feeding, and just the right amount of sun and water.
We hope this guide has shown you exactly how to look after calla lilies outdoors, from planting to overwintering.
Remember that outdoor calla lily care is all about balance, and once you get that balance right, these elegant flowers will reward you with stunning blooms.