Washington’s rainy winters and mild summers make early spring the best time to plant calla lily in washington, giving them moisture without waterlogging. Calla lilies thrive in the Pacific Northwest’s unique climate, but timing is everything. Plant too early, and frost can damage the rhizomes. Plant too late, and summer heat may stress them.
This guide walks you through exactly when and how to plant calla lilies in Washington. You’ll get step-by-step instructions, regional tips, and common mistakes to avoid. Let’s get your garden blooming.
Best Time To Plant Calla Lily In Washington
The ideal window for planting calla lily rhizomes in Washington is mid-March to early May. This timing aligns with the state’s transition from wet winter to mild spring. Soil temperatures should be consistently above 55°F (13°C) before you plant.
In western Washington, including Seattle and Tacoma, aim for late March to mid-April. Eastern Washington, with its colder winters and hotter summers, calls for a later start—mid-April to early May. Coastal areas like Port Angeles can plant as early as mid-March due to milder winters.
Why Early Spring Works Best
Washington’s spring rains provide natural irrigation for newly planted calla lilies. The soil stays moist but not soggy, which is perfect for rhizome establishment. Cool temperatures reduce transplant shock and encourage strong root growth before summer heat arrives.
Planting in early spring also gives your calla lilies a full growing season. They’ll bloom from June through August, with some varieties flowering into September. This timing maximizes your display before the first fall frost.
Check Your Local Frost Dates
Washington’s frost dates vary widely. Use these general guidelines:
- Western Washington: Last frost typically mid-March to early April
- Eastern Washington: Last frost usually late April to mid-May
- Coastal areas: Last frost as early as late February
- Mountain regions: Last frost can extend into June
Wait until all danger of frost has passed before planting. A sudden freeze can kill tender calla lily shoots. If you’re unsure, check your local extension office or use an online frost date calculator.
Can You Plant Calla Lilies In Fall In Washington?
Fall planting is risky in most of Washington. The state’s cold, wet winters can rot rhizomes before they establish. Only gardeners in USDA zones 8 and warmer—like parts of the San Juan Islands or coastal areas—should attempt fall planting.
If you try fall planting, choose a well-draining spot and mulch heavily. Even then, success is not guaranteed. For most Washington gardeners, spring planting is far more reliable.
How To Plant Calla Lilies In Washington Soil
Washington’s soil varies from heavy clay in the west to sandy loam in the east. Calla lilies need well-draining soil rich in organic matter. Here’s how to prepare your garden bed.
Step 1: Choose The Right Location
Calla lilies prefer full sun to partial shade. In Washington’s cloudy climate, aim for at least 6 hours of direct sunlight daily. Morning sun with afternoon shade works well, especially in hotter eastern regions.
Avoid low-lying areas where water pools. Calla lilies like moisture but not standing water. Raised beds or slopes are ideal for drainage.
Step 2: Amend The Soil
Test your soil pH first. Calla lilies prefer slightly acidic to neutral soil (pH 6.0 to 7.0). Washington’s soil is often acidic due to pine forests and rainfall. Add lime if your pH is below 6.0.
Mix in 2-3 inches of compost or well-rotted manure. This improves drainage in clay soil and adds nutrients. For sandy soil, compost helps retain moisture.
Improving Clay Soil In Western Washington
Western Washington’s clay soil can be challenging. Follow these tips:
- Add coarse sand or perlite to improve drainage
- Work in organic matter like leaf mold or peat moss
- Consider raised beds 8-12 inches high
- Plant on mounds to keep rhizomes above water
Step 3: Plant The Rhizomes
Dig holes 4 inches deep and 12-18 inches apart. Place the rhizome with the pointed side up (the growing tips should face upward). Cover with soil and water gently.
Space smaller varieties 8-12 inches apart. Larger types like ‘Crystal Blush’ need 18-24 inches. Crowded plants produce fewer flowers and are more prone to disease.
Step 4: Water And Mulch
Water thoroughly after planting. Keep the soil consistently moist but not waterlogged. Washington’s spring rains usually provide enough moisture, but check weekly during dry spells.
Apply a 2-inch layer of organic mulch like bark chips or straw. Mulch retains moisture, suppresses weeds, and moderates soil temperature. Keep mulch away from the stems to prevent rot.
Caring For Calla Lilies Throughout The Growing Season
Once planted, calla lilies need minimal care. Focus on watering, fertilizing, and pest control. Here’s what to do month by month.
Spring Care (March-May)
After planting, watch for shoots emerging in 2-4 weeks. Remove any weeds that compete for nutrients. If a late frost threatens, cover young shoots with a frost cloth overnight.
Apply a balanced fertilizer (10-10-10) when shoots appear. Repeat every 4-6 weeks through the growing season. Avoid high-nitrogen fertilizers, which promote leaves over flowers.
Summer Care (June-August)
Water deeply once a week during dry periods. In eastern Washington’s heat, you may need to water twice weekly. Check soil moisture by sticking your finger 2 inches into the soil—if it feels dry, water.
Deadhead spent flowers to encourage more blooms. Cut the stem at the base when the flower fades. Leave the foliage intact until it yellows naturally.
Dealing With Pests And Diseases
Common issues in Washington include:
- Slugs and snails: Use beer traps or diatomaceous earth
- Aphids: Spray with insecticidal soap or neem oil
- Botrytis blight: Improve air circulation and avoid overhead watering
- Root rot: Ensure proper drainage and avoid overwatering
Fall Care (September-October)
As temperatures cool, reduce watering. Let the foliage die back naturally. This allows the rhizome to store energy for next year.
In most of Washington, calla lilies are not winter-hardy. You have two options: dig up rhizomes for storage or treat them as annuals. For reliable blooms next year, dig them up.
How To Overwinter Calla Lilies In Washington
Washington’s winters are too cold for calla lilies to survive in the ground. USDA zones 7 and below require winter storage. Here’s how to do it right.
When To Dig Up Rhizomes
Wait until after the first frost kills the foliage. This usually happens in October or November in western Washington. In eastern Washington, it may be late September.
Use a garden fork to gently lift the rhizomes. Shake off excess soil and cut back the dead leaves to 2 inches. Let the rhizomes dry in a warm, airy place for 1-2 days.
How To Store Rhizomes
Place dried rhizomes in a box or paper bag filled with peat moss, vermiculite, or dry sand. Store them in a cool, dark place between 45-55°F (7-13°C). A basement or garage works well.
Check monthly for rot or shriveling. Remove any soft or moldy rhizomes. If they shrivel, mist lightly with water. Do not let them get wet.
Alternative: Grow In Containers
If you prefer not to dig, grow calla lilies in pots. Move containers to a frost-free location like a garage or shed before the first frost. Water sparingly every 4-6 weeks during winter.
In spring, bring pots back outside after the last frost. This method works well for gardeners with limited space or mobility issues.
Regional Tips For Planting Calla Lilies In Washington
Washington’s diverse climate means one-size-fits-all advice doesn’t work. Here are tips for specific regions.
Western Washington (Seattle, Tacoma, Olympia)
Focus on drainage. The region’s heavy clay soil and high rainfall can rot rhizomes. Plant in raised beds or mounds. Use a soil amendment mix of compost and sand.
Choose disease-resistant varieties like ‘Calla Lily Black Star’ or ‘Calla Lily Pink Mist’. These handle humidity better than some hybrids.
Eastern Washington (Spokane, Yakima, Wenatchee)
Plant later to avoid late frosts. Eastern Washington’s continental climate means colder winters and hotter summers. Provide afternoon shade to prevent leaf scorch.
Water more frequently during summer. Drip irrigation works well to keep foliage dry and reduce disease risk. Mulch heavily to retain moisture.
Coastal Areas (Port Angeles, Bellingham)
Milder winters allow earlier planting. You can start as early as mid-March. Coastal winds can damage tall stems, so stake plants if needed.
Salt spray is not usually a problem for calla lilies, but avoid planting too close to the beach. Rinse foliage occasionally if salt accumulates.
Mountain Regions (Leavenworth, Winthrop)
Short growing seasons require careful timing. Start rhizomes indoors 6-8 weeks before the last frost. Transplant after soil warms in late May or early June.
Choose fast-maturing varieties like ‘Calla Lily Flame’ or ‘Calla Lily Picasso’. These bloom in 60-70 days from planting.
Common Mistakes When Planting Calla Lilies In Washington
Avoid these errors to ensure success:
- Planting too early: Frost kills tender shoots. Wait until soil warms.
- Poor drainage: Clay soil needs amending. Use raised beds if necessary.
- Overwatering: Washington’s rain is usually enough. Check soil before adding water.
- Planting too deep: Rhizomes need 4 inches of cover. Deeper planting delays growth.
- Ignoring sunlight: Too much shade reduces blooms. Aim for 6 hours of sun.
- Skipping winter storage: Most Washington winters kill calla lilies in the ground.
Frequently Asked Questions About Calla Lilies In Washington
Can I Plant Calla Lilies In Pots In Washington?
Yes, container planting works well. Use pots with drainage holes and quality potting mix. Move pots indoors before frost. This method is ideal for renters or small gardens.
How Long Do Calla Lilies Bloom In Washington?
With proper care, calla lilies bloom for 6-8 weeks from June to August. Deadheading extends the bloom period. Some varieties rebloom in early fall if conditions are right.
Do Calla Lilies Need Full Sun In Washington?
They need at least 6 hours of direct sunlight daily. In eastern Washington, afternoon shade prevents heat stress. In western Washington, full sun is usually fine due to lower intensity.
Can I Leave Calla Lilies In The Ground Over Winter In Washington?
Only in USDA zones 8 and warmer, like parts of the San Juan Islands. Most of Washington is zone 7 or colder, so rhizomes need winter storage. Mulching heavily may help in mild winters but is risky.
What Is The Best Fertilizer For Calla Lilies In Washington?
Use a balanced fertilizer like 10-10-10 or a bloom booster like 5-10-10. Apply every 4-6 weeks during the growing season. Avoid high-nitrogen formulas that promote leaves over flowers.
Final Tips For Success
Start with high-quality rhizomes from a reputable nursery. Look for firm, plump rhizomes without soft spots. Pre-sprout them indoors if you want an earlier start—place them in damp peat moss 4 weeks before planting.
Group calla lilies in clusters for visual impact. Plant 3-5 rhizomes together for a natural look. Mix colors like white, pink, and yellow for a stunning display.
Keep a gardening journal. Note your planting dates, weather conditions, and bloom times. This helps you refine your timing each year. With practice, you’ll master the best time to plant calla lily in washington for your specific microclimate.
Remember, calla lilies are forgiving plants. Even if you plant a week early or late, they usually adapt. The key is consistent moisture, good drainage, and protection from frost. Follow these guidelines, and you’ll enjoy elegant blooms all summer long.