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Calla lilies can be planted outside in Massachusetts with the right preparation and timing.
These elegant flowers can add a splash of color and charm to your garden even in a New England climate like Massachusetts.
However, successful growth depends on understanding the local growing conditions and how calla lilies respond to them.
In this post, we will dive into whether you can plant calla lilies outside in Massachusetts, the best times to plant them, and tips for thriving calla lilies in outdoor Massachusetts gardens.
Let’s get started!
Why You Can Plant Calla Lilies Outside in Massachusetts
Calla lilies can be planted outside in Massachusetts, but there are specific precautions to keep in mind due to the state’s temperate climate and sometimes harsh winters.
1. Calla Lilies Are Hardy in Zones 8-10 but Can Adapt
Calla lilies (Zantedeschia spp.) are officially hardy in USDA zones 8 through 10, which means they thrive best in warmer climates than most of Massachusetts.
Massachusetts falls mostly in USDA zones 5 and 6, which means outdoors calla lilies won’t survive the harsh cold winters without special care.
However, with proper planning, you can still grow them as annuals or dig up the rhizomes before frost and overwinter them indoors.
2. Massachusetts’ Short Growing Season Requires Timing
Because calla lilies grow from rhizomes that sprout in spring, planting them outside in Massachusetts needs careful timing to take advantage of the short growing season.
Waiting until the danger of frost has completely passed (usually mid to late May) is key to planting calla lilies outside safely.
They will grow and bloom through the summer months when conditions are warmer and sunnier before going dormant in fall.
3. Well-Drained Soil and Sunlight Are Key
Calla lilies prefer moist, well-drained soil and a spot that gets partial to full sunlight—conditions that can be met in many Massachusetts gardens with some adjustments.
If your garden has heavy clay soil, amending it with organic matter or planting in raised beds or containers can help prevent rhizomes from rotting.
A location with morning sun and afternoon shade provides an ideal balance to protect the delicate flowers from the hottest part of the day.
When to Plant Calla Lilies Outside in Massachusetts
The exact timing of when to plant calla lilies outside in Massachusetts affects how well they take root and bloom during the season.
1. Plant After Last Frost Date
The safest rule to follow is to plant calla lily rhizomes outdoors only after the last frost date, which in Massachusetts generally falls between May 10 and May 20 depending on your region.
Planting too early when the ground is cold or frost is still a threat can damage the rhizomes and stunt growth.
2. Start Rhizomes Indoors in April
To get a jumpstart on the growing season, many gardeners in Massachusetts start calla lily rhizomes indoors in pots or trays around April.
This allows the rhizomes to sprout roots and shoots in a warm, controlled environment before transferring outside once temperatures rise.
Starting indoors results in earlier blooming and stronger plants when finally planted outside.
3. Consider the Length of Growing Season
Since calla lilies require 3 to 4 months of frost-free weather to develop beautiful flowers, planting after mid-May will still give adequate time before the first frost in October.
Still, in northern parts of Massachusetts with shorter summers, you may want to use containers you can bring inside before frost hits.
Tips for Successfully Growing Calla Lilies Outside in Massachusetts
Planting calla lilies outside in Massachusetts takes a bit of effort, but with these tips, you can enjoy their vibrant blooms all summer long.
1. Choose Quality Rhizomes
Select plump, firm calla lily rhizomes from a reputable garden center or nursery in spring.
Ensure there are no signs of mold, softness, or damage to avoid planting weak starters.
2. Prepare the Soil Properly
Amend the garden soil with compost or peat moss to improve drainage and nutrient content.
Calla lilies like soil that stays moist but not waterlogged, so good drainage is crucial.
Avoid planting in areas where water pools after rains.
3. Plant Rhizomes at the Right Depth
Plant calla lily rhizomes about 3 to 4 inches deep in the soil with the growing points facing up.
Space them 12 to 18 inches apart to give room for growth.
Cover with soil and water well to encourage root establishment.
4. Water Consistently but Don’t Overdo It
Keep the soil evenly moist throughout the growing season.
Calla lilies are sensitive to both drought and root rot from soggy soil, so consistent watering without saturation is key.
5. Mulch to Retain Moisture and Cool Roots
Applying a layer of mulch around your calla lilies helps retain soil moisture and regulate temperature.
Organic mulch like shredded bark also suppresses weeds that compete for nutrients.
6. Feed for Better Blooms
Use a balanced liquid fertilizer every 4 to 6 weeks during the growing season to promote healthy growth and vibrant flowers.
Be careful not to over-fertilize as this can cause lush foliage but fewer blooms.
7. Dig Up Rhizomes Before the First Frost
In Massachusetts, calla lilies cannot typically survive winter in the ground without protection.
Once the foliage yellows and dies back in fall, dig up the rhizomes carefully.
Clean them, let them dry, and store them in a cool, dark, dry place indoors until next spring.
8. Use Containers for Flexibility
Planting calla lilies in containers is an excellent option in Massachusetts.
This allows you to bring the plants indoors before the first frost and protect them over winter.
Containers also help you control soil conditions better for optimal growth.
How to Choose Calla Lily Varieties for Massachusetts Gardens
The type of calla lily you pick can affect how well they perform outside in Massachusetts.
1. Look for Cold-Tolerant Varieties
While all calla lilies prefer warmer climates, some varieties like the classic ‘Black Star’ or ‘Pink Mist’ show more tolerance for cooler conditions.
These may be more forgiving if you experience cool nights in early summer.
2. Choose Compact or Dwarf Types for Containers
Compact calla lily varieties like ‘Little Suzie’ are perfect for container planting and small-space gardens.
They bloom profusely and are easier to manage indoors in the winter.
3. Select Colors That Complement Your Garden
Calla lilies come in shades of white, yellow, pink, purple, and even deep burgundy.
Pick colors that harmonize with your garden theme or bring fresh contrast to your flowerbeds.
So, Can You Plant Calla Lilies Outside in Massachusetts?
Yes, you can plant calla lilies outside in Massachusetts, but success depends on careful timing, soil preparation, and winter protection.
Plant calla lily rhizomes after the danger of frost passes, typically in mid-May, and provide well-drained soil and consistent moisture.
For the best results, start rhizomes indoors before transplanting outside or grow them in containers you can bring indoors for winter.
Given Massachusetts’ colder climate, digging up rhizomes before the first frost and storing them indoors is essential for perennial growth.
With these strategies, calla lilies can thrive outdoors in Massachusetts and reward your garden with their stunning blooms season after season.
So go ahead and enjoy planting calla lilies outside in Massachusetts this year!