Tennessee’s moderate climate offers a wide planting window, but late April remains the sweet spot for calla lilies. Knowing the best time to plant calla lily in tennessee can mean the difference between a stunning summer display and a disappointing season. These elegant flowers thrive when you time their planting just right.
Calla lilies are not true lilies, but they bring a touch of sophistication to any garden. They grow from rhizomes, which need warm soil to sprout. In Tennessee, you have two main options: plant in spring for summer blooms or start them indoors for an earlier show.
Let’s break down exactly when and how to plant these beauties in the Volunteer State.
Best Time To Plant Calla Lily In Tennessee
The ideal window for planting calla lilies outdoors in Tennessee is from mid-April to early May. This timing ensures the soil has warmed to at least 60°F, which is critical for healthy root development. Planting too early risks rot from cold, wet ground.
For most of Tennessee, which falls in USDA hardiness zones 6a to 7b, late April works perfectly. The last frost date typically passes by mid-April in lower elevations, but higher areas may need to wait until early May.
If you want earlier blooms, start rhizomes indoors 6-8 weeks before your last frost date. This gives you a head start on the growing season.
Spring Planting Guidelines For Tennessee Gardens
Follow these steps for successful spring planting:
- Wait until soil temperature reaches 60°F consistently
- Choose a location with full sun to partial afternoon shade
- Amend heavy clay soil with compost to improve drainage
- Plant rhizomes 4 inches deep with the growing tips facing up
- Space plants 12-18 inches apart for good air circulation
Tennessee’s spring weather can be unpredictable. A late cold snap can damage tender new growth. Keep frost cloth handy if temperatures drop below 50°F after planting.
Fall Planting Considerations
Fall planting is risky in Tennessee. Calla lilies are not winter-hardy in most of the state. Only gardeners in zone 7b (southern Tennessee) might try fall planting, and even then, success is not guaranteed.
If you attempt fall planting, do it at least 6 weeks before the first expected frost. This gives rhizomes time to establish roots. But honestly, spring planting is much more reliable.
For most Tennessee gardeners, stick with spring planting for the best results. The best time to plant calla lily in tennessee is when the soil is warm and the danger of frost has passed.
Understanding Tennessee’s Climate Zones
Tennessee spans two main USDA hardiness zones: 6a in the higher elevations and 7b in the warmer southern and western areas. This affects planting times.
Zone 6A (Eastern Tennessee Mountains)
In the mountainous eastern part of the state, winters are colder and springs come later. Gardeners here should plant calla lilies in early to mid-May. The soil warms slower at higher elevations.
Consider these tips for zone 6a:
- Start rhizomes indoors in March
- Use raised beds for better drainage
- Mulch heavily after planting to retain warmth
- Expect blooms in late July to August
Zone 7B (Central And Western Tennessee)
Nashville, Memphis, and most of the central region fall in zone 7b. These areas have milder winters and earlier springs. Planting can begin in mid-April.
Zone 7b gardeners enjoy a longer growing season:
- Plant outdoors by April 15
- Expect blooms by June or July
- Rhizomes may survive winter with heavy mulch
- Consider container planting for easier winter care
Preparing Your Soil For Calla Lilies
Calla lilies prefer rich, well-draining soil. Tennessee’s native soil varies widely, from heavy clay in the west to rocky loam in the east. You may need to amend your soil.
Testing And Amending Soil
Start with a simple soil test. Your local county extension office can help. Calla lilies like a slightly acidic pH between 6.0 and 6.5.
To improve drainage in clay soil:
- Dig the planting area 12 inches deep
- Mix in 3-4 inches of compost or aged manure
- Add coarse sand or perlite for extra drainage
- Create raised beds if drainage is poor
For sandy or rocky soil, add organic matter to retain moisture. Calla lilies need consistent moisture but cannot tolerate soggy roots.
Container Planting Options
Many Tennessee gardeners grow calla lilies in containers. This gives you control over soil quality and makes winter storage easier. Use a pot with drainage holes and high-quality potting mix.
Container planting also lets you move plants to catch optimal sunlight. Calla lilies bloom best with morning sun and afternoon shade, especially during Tennessee’s hot summers.
Step-By-Step Planting Guide
Follow this detailed process for planting calla lily rhizomes:
Step 1: Choose Healthy Rhizomes
Select firm, plump rhizomes from a reputable source. Avoid any that feel mushy or show signs of mold. Larger rhizomes often produce more blooms.
Look for rhizomes with visible “eyes” or growing points. These are small bumps where stems will emerge.
Step 2: Soak Rhizomes Before Planting
Soak rhizomes in room-temperature water for 1-2 hours before planting. This rehydrates them and encourages faster sprouting. Do not soak longer than 4 hours, as this can cause rot.
Step 3: Prepare The Planting Hole
Dig a hole 4-6 inches deep. Place the rhizome with the growing tips facing upward. Cover with soil and water thoroughly.
Space multiple rhizomes 12-18 inches apart. This allows room for foliage and prevents overcrowding.
Step 4: Water And Mulch
Water deeply after planting to settle the soil. Apply a 2-inch layer of organic mulch around the plants. Mulch helps retain moisture and keeps soil temperatures stable.
Keep the soil consistently moist but not waterlogged. Check moisture levels by sticking your finger 1 inch into the soil.
Caring For Calla Lilies Through The Season
Once planted, calla lilies need regular care to thrive in Tennessee’s climate. Here’s what to focus on:
Watering Requirements
Calla lilies need about 1 inch of water per week during the growing season. In Tennessee’s hot summers, you may need to water more frequently. Always water at the base of the plant to avoid wetting the foliage.
Reduce watering in late summer as the plants begin to go dormant. This helps the rhizomes prepare for winter storage.
Fertilizing Schedule
Feed calla lilies with a balanced, water-soluble fertilizer every 4-6 weeks during the growing season. Use a 10-10-10 formula or one specifically for flowering bulbs.
Avoid high-nitrogen fertilizers, which promote foliage at the expense of blooms. Stop fertilizing in late August when the plants start to yellow.
Deadheading And Pruning
Remove spent flowers to encourage more blooms. Cut the flower stem back to the base of the plant. Leave the foliage intact until it naturally yellows and dies back.
The leaves continue to photosynthesize and store energy in the rhizome for next year’s growth. Do not cut them back prematurely.
Overwintering Calla Lilies In Tennessee
Calla lilies are not winter-hardy in most of Tennessee. You must dig up and store rhizomes before the first hard frost. This is typically in October or November.
Digging And Storing Rhizomes
Follow these steps for successful overwintering:
- Wait until foliage turns yellow and dies back
- Dig carefully to avoid damaging rhizomes
- Shake off excess soil and trim dead foliage
- Let rhizomes dry in a warm, airy place for 1-2 days
- Store in peat moss or vermiculite in a cool, dark location
- Maintain storage temperatures between 45-55°F
Check stored rhizomes monthly for signs of rot or drying out. Discard any that become mushy or shriveled.
Container Overwintering Option
If you grow calla lilies in containers, you can move the pots indoors for winter. Place them in a cool, dark room and stop watering. The rhizomes will remain dormant until spring.
This method is easier than digging and storing bare rhizomes. Just ensure the container does not freeze solid.
Common Problems And Solutions
Even with proper timing, calla lilies can face issues in Tennessee gardens. Here are common problems and how to fix them:
Yellowing Leaves
Yellow leaves often indicate overwatering or poor drainage. Check soil moisture and improve drainage if needed. Yellowing can also be a sign of nutrient deficiency, especially nitrogen.
Apply a balanced fertilizer if leaves yellow during active growth. If yellowing occurs in late summer, it is normal dormancy.
No Blooms
Failure to bloom can result from several factors:
- Too much shade
- Overcrowded rhizomes
- Excess nitrogen fertilizer
- Insufficient chilling period
- Immature rhizomes
Ensure your plants get at least 4-6 hours of direct sunlight daily. Divide overcrowded clumps every 3-4 years.
Pest Issues
Calla lilies are generally pest-resistant, but aphids and spider mites can occasionally appear. Spray affected plants with a strong stream of water or use insecticidal soap.
Slugs and snails may also target young foliage. Use organic slug bait or hand-pick them in the evening.
Frequently Asked Questions
Can I Plant Calla Lilies In Tennessee In July?
July is too late for outdoor planting in Tennessee. The heat stresses young plants, and they may not bloom before frost. Stick to spring planting for best results.
What Is The Latest Time To Plant Calla Lilies In Tennessee?
Early June is the latest safe planting time for calla lilies in Tennessee. This gives them enough time to bloom before the first fall frost in October or November.
Do Calla Lilies Come Back Every Year In Tennessee?
Only in zone 7b with heavy winter mulch might calla lilies survive outdoors. In most of Tennessee, you must dig and store rhizomes each winter for replanting in spring.
How Deep Should I Plant Calla Lily Rhizomes In Tennessee?
Plant rhizomes 4-6 inches deep in Tennessee soil. Deeper planting provides insulation against temperature fluctuations but can delay sprouting.
Can I Leave Calla Lilies In Pots Over Winter In Tennessee?
Yes, move pots to a cool, dark indoor location like a basement or garage. Keep the soil barely moist and do not water during dormancy.
Final Tips For Tennessee Gardeners
Timing is everything when it comes to calla lilies. The best time to plant calla lily in tennessee is late April to early May, after the soil warms and frost danger passes. This gives your plants the best chance for a spectacular summer show.
Remember these key points:
- Wait for soil temperature of 60°F
- Choose a sunny location with afternoon shade
- Amend heavy clay soil for drainage
- Water consistently but avoid soggy conditions
- Dig and store rhizomes before first frost
With proper timing and care, calla lilies will reward you with elegant, long-lasting blooms. Their trumpet-shaped flowers add a touch of class to any Tennessee garden, whether planted in borders, containers, or cutting gardens.
Start planning your planting date now. Mark your calendar for late April, and prepare your soil in advance. Your calla lilies will thank you with a stunning display that lasts from summer well into early fall.
Tennessee’s climate offers a great opportunity for growing these beautiful flowers. Just get the timing right, and you will enjoy their graceful presence in your garden for years to come.