Can You Plant Calla Lilies Outside In Massachusetts

Yes, you can plant calla lilies outside in Massachusetts, but you have to treat them as tender perennials that need a little extra help to survive the colder months.
 
These stunning, trumpet-shaped flowers are not naturally hardy in the Bay State’s USDA hardiness zones, which mostly range from 5b to 7a.
 
So, can you plant calla lilies outside in Massachusetts and expect them to come back year after year?
 
The short answer is yes, if you’re willing to dig them up in the fall or give them a thick layer of mulch for winter protection.
 
In this post, we’ll explore everything you need to know about planting calla lilies outside in Massachusetts, from timing and soil prep to overwintering tricks that keep them thriving.
 
Let’s dig in and get those gorgeous blooms growing in your New England garden.
 

Why You Can Plant Calla Lilies Outside in Massachusetts

Calla lilies (Zantedeschia) are actually not true lilies at all, but they are beloved for their elegant, cup-shaped spathes and glossy arrow-shaped leaves.
 
In their native South Africa, these plants grow in warm, moist conditions, so they aren’t used to freezing temperatures.
 
However, that doesn’t mean you can’t plant calla lilies outside in Massachusetts; it just means you need to plan around the frost dates.
 
The key is to treat them as annuals in colder zones or to lift the rhizomes each autumn and store them indoors.
 
With a little effort, you can enjoy these beauties as striking container plants or as part of a mixed border all summer long.
 
Here’s why planting calla lilies outside in Massachusetts is totally doable with the right approach.
 

1. Massachusetts Summers Are Perfect for Calla Lilies

When you plant calla lilies outside in Massachusetts, you’re giving them exactly what they love during the growing season.
 
They thrive in warm daytime temperatures between 60°F and 75°F, which is typical for New England summers.
 
Your calla lilies will bloom from mid-summer into early fall, producing those iconic white, pink, yellow, or deep purple flowers.
 
The humidity in Massachusetts also helps keep their foliage lush and happy, as long as the soil drains well.
 

2. Choosing the Right Spot Makes All the Difference

If you’re going to plant calla lilies outside in Massachusetts, pick a spot with full sun to partial shade.
 
Morning sun with afternoon shade is ideal, especially during those hot July and August stretches.
 
The soil should be rich, moist, and well-draining, because calla lilies hate sitting in waterlogged soil, which can rot their rhizomes.
 
Amend heavy clay soil with compost or aged manure before planting to give them a strong start.
 
A slightly acidic to neutral pH (around 6.0 to 7.0) is perfect for these elegant plants.
 

3. Timing Your Planting Around Frost

The biggest question isn’t whether you can plant calla lilies outside in Massachusetts, but when.
 
You’ll want to wait until all danger of frost has passed, which is usually after Memorial Day in most parts of the state.
 
If you’re eager to get a head start, you can plant the rhizomes in pots indoors about 4-6 weeks before the last expected frost date.
 
Then, harden them off gradually before transplanting them into your garden beds.
 
Planting indoor-started calla lilies outside in Massachusetts gives you earlier blooms and a longer display in the fall.
 

How to Plant Calla Lilies Outside in Massachusetts

Getting the planting technique right is crucial for success.
 
Follow these steps, and you’ll see vigorous growth and plenty of flowers.
 

1. Plant Rhizomes at the Right Depth

Dig a hole about 3 to 4 inches deep and place the rhizome with the pointed side facing up.
 
Space each rhizome about 12 inches apart to give them room to spread and prevent overcrowding.
 
Cover them with soil, firm it gently, and water thoroughly after planting.
 
If you’re planting several calla lilies outside in Massachusetts, group them in clusters of three or more for a fuller look.
 

2. Water Consistently But Don’t Drown Them

Calla lilies love moisture, so you’ll need to keep the soil consistently damp during the growing season.
 
Water deeply once or twice a week, depending on rainfall, and increase watering during dry spells.
 
But always ensure good drainage, as soggy conditions can cause the rhizomes to rot.
 
A layer of mulch around the plants helps retain soil moisture and keeps the roots cool in summer heat.
 

3. Feed Them for Bigger Blooms

Fertilize your calla lilies every 4 to 6 weeks with a balanced, water-soluble fertilizer.
 
A formula like 10-10-10 works well, or you can use a slow-release granular fertilizer at planting time.
 
Stop feeding once the flowers begin to fade to allow the plant to focus on storing energy in the rhizome.
 
Deadhead spent flowers regularly to encourage more blooms and keep the plant looking tidy.
 

Overwintering Calla Lilies in Massachusetts

The trickiest part about planting calla lilies outside in Massachusetts is getting them through the winter.
 
Because they aren’t cold-hardy, you have two solid options: dig them up or mulch them heavily.
 

1. Digging Up and Storing Rhizomes

After the first frost kills back the foliage, carefully dig up the rhizomes with a garden fork.
 
Shake off excess soil and let them dry in a warm, airy spot for a few days.
 
Trim away any remaining stems and leaves, then store the rhizomes in a box filled with peat moss or sawdust.
 
Keep them in a cool, dark place around 50°F, like an unheated basement or garage.
 
Then, you can plant calla lilies outside in Massachusetts again next spring with the same rhizomes.
 

2. Mulching for Marginal Hardiness

If you live in the warmer parts of Massachusetts, like Cape Cod or the coastal zones, you might get away with leaving them in the ground.
 
Apply a thick 6-8 inch layer of straw, leaves, or pine needles after the ground freezes.
 
This insulation prevents the soil from heaving and keeps the rhizomes from freezing solid.
 
However, this method is risky, and a harsh winter can still kill them.
 
For most gardeners, digging them up is the safest bet.
 

Common Mistakes to Avoid When Planting Calla Lilies in Massachusetts

Even though it’s easy to plant calla lilies outside in Massachusetts, a few pitfalls can ruin your efforts.
 
Avoid planting too early, as a late frost can kill young shoots.
 
Don’t let the soil dry out completely, because calla lilies will drop their flowers and go dormant if stressed.
 
Also, be careful with overwatering in heavy clay soils, which can lead to rot.
 
If you’re growing calla lilies in containers, make sure the pots have drainage holes and are moved to a sheltered spot before frost arrives.
 

So, Can You Plant Calla Lilies Outside in Massachusetts?

Yes, you can plant calla lilies outside in Massachusetts as long as you follow a few simple guidelines.
 
They’ll reward you with an abundance of elegant, long-lasting blooms from summer through early fall.
 
The secret is to time your planting after the last frost and to dig up the rhizomes before the ground freezes in winter.
 
With proper care and a bit of effort, these tropical-looking flowers can absolutely thrive in your Massachusetts garden.
 
So go ahead, get your hands dirty, and enjoy the beauty of calla lilies right in your own backyard.