Can Calla Lilies Be Planted Outside In Zone 7 – A Complete Guide
Dreaming of those elegant, trumpet-shaped calla lily blooms gracing your garden, but wondering if your Zone 7 climate is too harsh for them? You’re not alone! Many gardeners in our temperate zone gaze longingly at these exotic beauties, unsure if they can truly thrive outdoors. The good news, my friend, is a resounding “yes!” With the right knowledge and a little preparation, you absolutely
can calla lilies be planted outside in Zone 7
, bringing their sophisticated charm to your landscape.
This comprehensive guide from Greeny Gardener will walk you through everything you need to know, from selecting the perfect spot to ensuring your calla lilies return year after year. We’ll cover the best practices, common challenges, and sustainable tips to help you cultivate a stunning display. By the end, you’ll be ready to embrace the joy of growing these magnificent flowers with confidence.
What's On the Page
- 1 Understanding Calla Lilies and Zone 7 Hardiness
- 2 How to Can Calla Lilies Be Planted Outside in Zone 7: Site Selection and Soil Prep
- 3 Planting Your Calla Lily Rhizomes: A Step-by-Step Guide
- 4 Essential Care for Thriving Calla Lilies in Zone 7
- 5 Winterizing Calla Lilies in Zone 7: Ensuring Their Return
- 6 Troubleshooting Common Problems with Calla Lilies in Zone 7
- 7 Benefits of Can Calla Lilies Be Planted Outside in Zone 7
- 8 Frequently Asked Questions About Calla Lilies in Zone 7
- 9 Conclusion: Embrace the Beauty of Calla Lilies in Your Zone 7 Garden!
Understanding Calla Lilies and Zone 7 Hardiness
Before we dig in, let’s clarify what we’re working with. Calla lilies (
Zantedeschia spp.
) are native to southern Africa and are typically considered tender perennials or annuals in colder climates. However, in Zone 7, which experiences average minimum winter temperatures between 0°F and 10°F (-17.8°C to -12.2°C), they fall into a delightful grey area.
This means that while they might not be fully “hardy” in the same way a hosta or peony is, they can often survive mild Zone 7 winters outdoors with proper care and protection. The key is understanding their needs and preparing them for the colder months. Don’t worry—these flowers are perfect for beginners!
Most calla lily varieties will enter a dormant period as temperatures drop, much like many other bulbs and tubers. Our goal is to ensure they rest safely through winter and re-emerge vibrant in spring. This guide will provide all the necessary can calla lilies be planted outside in Zone 7 tips for success.
How to Can Calla Lilies Be Planted Outside in Zone 7: Site Selection and Soil Prep
Getting your calla lilies off to a great start begins with choosing the right location and preparing their new home. Think of it like setting the foundation for a beautiful house—it needs to be solid!
Picking the Perfect Spot: Sun Exposure
Calla lilies love sunshine, but they can be a bit sensitive to intense afternoon heat, especially in the warmer stretches of Zone 7.
- Full Sun to Partial Shade: Aim for a spot that receives at least six hours of direct sunlight per day.
- Morning Sun is Ideal: If your garden experiences scorching afternoon sun, a location that gets morning sun and some afternoon shade is often the best choice. This protects their delicate blooms and foliage from sunburn.
- Consider Container Planting: For ultimate flexibility, planting calla lilies in containers allows you to move them to optimize sun exposure throughout the day or season.
Observing your garden’s sunlight patterns throughout the day will help you make the best decision for your specific microclimate.
Building a Healthy Home: Soil Requirements
Good drainage is paramount for calla lilies. They thrive in consistently moist soil but absolutely detest soggy, waterlogged conditions, which can lead to rhizome rot.
- Well-Draining Soil: If you have heavy clay soil, you’ll definitely want to amend it.
- Rich in Organic Matter: Calla lilies are heavy feeders and appreciate fertile soil. Incorporate plenty of compost, well-rotted manure, or other organic matter into your planting bed. This improves drainage *and* provides essential nutrients.
- Slightly Acidic to Neutral pH: Calla lilies prefer a soil pH between 6.0 and 7.0. A simple soil test can confirm your current pH, and amendments can be made if necessary.
To prepare your bed, dig down about 12-18 inches and mix in a generous amount of compost. This creates a fluffy, nutrient-rich environment where your calla lily rhizomes can truly flourish. This is one of the most important can calla lilies be planted outside in Zone 7 best practices.
Planting Your Calla Lily Rhizomes: A Step-by-Step Guide
Once you’ve prepared their ideal home, it’s time for the exciting part: planting!
When to Plant in Zone 7
Timing is crucial for outdoor planting.
- After the Last Frost: Wait until all danger of frost has passed in your area. In Zone 7, this typically means late April to early May, but always check your local forecast.
- Warm Soil is Key: Calla lily rhizomes prefer warm soil to sprout. Planting too early in cold soil can lead to rot.
A good rule of thumb is to plant them around the same time you would plant tomatoes or other warm-season annuals.
The Planting Process
Follow these simple steps for successful planting:
- Dig a Hole: Dig a hole approximately 4-6 inches deep and twice as wide as your rhizome.
- Orient the Rhizome: Place the rhizome (which looks like a lumpy, irregular potato) with the “eyes” or growth points facing upwards. These are often small, bumpy nodes.
- Cover Gently: Cover the rhizome with 4-6 inches of prepared soil.
- Spacing: If planting multiple calla lilies, space them about 12-18 inches apart to allow for adequate air circulation and growth.
- Water Thoroughly: After planting, water the area well to settle the soil around the rhizome.
Initially, water sparingly until you see sprouts emerging. Overwatering before growth begins can encourage rot. This hands-on approach is key to how to can calla lilies be planted outside in Zone 7 successfully.
Essential Care for Thriving Calla Lilies in Zone 7
Once planted, a consistent care routine will ensure your calla lilies produce those stunning blooms all season long. This
can calla lilies be planted outside in Zone 7 care guide
covers everything they need to flourish.
Watering Wisdom
Calla lilies are thirsty plants, especially when actively growing and blooming.
- Consistent Moisture: Keep the soil consistently moist but never soggy. Aim for about 1 inch of water per week, either from rain or irrigation.
- Deep Watering: Water deeply to encourage strong root development.
- Reduce in Dormancy: As the weather cools and the plant prepares for dormancy, gradually reduce watering.
A good way to check moisture levels is to stick your finger about an inch or two into the soil. If it feels dry, it’s time to water.
Feeding for Fantastic Flowers
To support their vigorous growth and prolific flowering, calla lilies benefit from regular feeding.
- Balanced Fertilizer: Start with a balanced liquid fertilizer (e.g., 10-10-10) every 2-4 weeks during the active growing season.
- Bloom Booster: Once flower buds begin to form, switch to a fertilizer higher in phosphorus (the middle number, e.g., 5-10-5) to encourage more blooms.
- Organic Options: For an eco-friendly can calla lilies be planted outside in Zone 7 approach, incorporate compost tea or a slow-release organic granular fertilizer into your routine.
Always follow the package directions for any fertilizer you use to avoid over-feeding, which can burn the plants.
Pest Patrol and Disease Prevention
Calla lilies are relatively pest-free, but it’s good to be vigilant.
- Common Pests: Watch out for aphids, slugs, and snails. Aphids can be rinsed off with a strong stream of water or treated with insecticidal soap. Slugs and snails can be managed with organic baits or hand-picking.
- Root Rot: The most common disease issue is root rot, almost always caused by overly wet or poorly draining soil. Ensure proper drainage to prevent this.
- Fungal Spots: In very humid conditions, you might see some fungal spots. Ensure good air circulation and avoid overhead watering late in the day.
A healthy plant is often the best defense against pests and diseases, so focus on good cultural practices.
Winterizing Calla Lilies in Zone 7: Ensuring Their Return
This is arguably the most critical section for Zone 7 gardeners. While some lucky gardeners in warmer parts of Zone 7 might get away with leaving them in the ground, most will find that some winter protection offers the best chance of survival. This is central to a successful
can calla lilies be planted outside in Zone 7 guide
.
Option 1: The “Dig and Store” Method (Recommended for Reliability)
This method guarantees your rhizomes will survive the winter and is highly recommended for consistently cold Zone 7 winters or if you want to ensure your prized varieties return.
- Wait for Frost: Allow the first light frost to “nip” the foliage, turning it yellow. This signals the plant to send energy back into the rhizome.
- Cut Back Foliage: Once the foliage has yellowed and died back, cut it down to about 2-3 inches above the soil line.
- Carefully Dig: Gently dig up the rhizomes, being careful not to damage them. Use a garden fork, working a good distance away from the plant to avoid piercing the rhizome.
- Clean and Cure: Brush off excess soil. Allow the rhizomes to “cure” in a dry, airy spot for a few days to a week. This helps harden the skin and prevents rot during storage.
- Store Properly: Store the cured rhizomes in a cool, dark, dry, and frost-free location (around 45-55°F or 7-13°C). A garage, basement, or unheated closet works well. Pack them in a paper bag, mesh bag, or a box filled with peat moss, sawdust, or vermiculite to prevent them from drying out completely.
Check on your stored rhizomes periodically throughout the winter, misting lightly if they seem too dry or removing any that show signs of rot.
Option 2: The “Leave and Mulch” Method (For Milder Zone 7 Areas or a Gamble)
This method is less reliable but can work in areas of Zone 7 that experience milder winters or if you’re willing to risk it.
- Cut Back Foliage: After the first frost, cut back the yellowed foliage as described above.
- Apply Thick Mulch: Cover the planting area with a very thick layer (6-12 inches) of insulating mulch. Straw, shredded leaves, pine needles, or wood chips work well. This acts as a protective blanket, preventing the soil from freezing deeply.
- Cross Your Fingers: In spring, remove the mulch once the danger of hard frost has passed, and watch for new growth.
While this is an easier method, it’s not foolproof. A particularly harsh winter or prolonged deep freeze can still kill the rhizomes. For guaranteed success, especially with valuable or favorite varieties, the “dig and store” method is the more sustainable can calla lilies be planted outside in Zone 7 option for long-term health.
Troubleshooting Common Problems with Calla Lilies in Zone 7
Even experienced gardeners encounter hiccups. Here are a few common issues and how to address them.
Why Are My Calla Lily Leaves Turning Yellow?
Yellowing leaves can be a sign of several things:
- Overwatering: This is the most common culprit. Ensure good drainage and allow the top inch or two of soil to dry out between waterings.
- Nutrient Deficiency: A lack of nitrogen can cause overall yellowing. Fertilize regularly with a balanced liquid feed.
- Natural Dormancy: As fall approaches, yellowing foliage is a natural sign the plant is preparing for dormancy.
- Too Much Sun/Heat: Intense afternoon sun can scorch leaves, leading to yellowing or browning.
Assess your watering habits and sun exposure first, as these are often the easiest to correct.
Why Isn’t My Calla Lily Blooming?
If you’re seeing lush foliage but no flowers, consider these factors:
- Insufficient Light: Calla lilies need plenty of sun to produce blooms. Ensure they are getting at least 6 hours of direct light.
- Too Much Nitrogen: A fertilizer too high in nitrogen encourages leafy growth at the expense of flowers. Switch to a bloom-boosting fertilizer (higher in phosphorus).
- Immature Rhizomes: Very small or newly divided rhizomes might need a season to establish before flowering profusely.
- Improper Dormancy: If you’re storing them, ensure they get a proper dormant period; otherwise, they may not bloom well the following season.
Patience and proper care are key. With a bit of adjustment, your calla lilies should burst into bloom.
Benefits of Can Calla Lilies Be Planted Outside in Zone 7
Beyond the sheer beauty, growing calla lilies outdoors in Zone 7 offers numerous advantages.
- Stunning Visual Impact: Their unique, architectural blooms add a touch of exotic elegance to any garden bed, border, or container. They are truly showstoppers!
- Excellent Cut Flowers: Calla lilies make magnificent, long-lasting cut flowers, perfect for bringing the garden’s beauty indoors. They’re a favorite for bouquets and arrangements.
- Variety of Colors: While white is classic, modern hybrids come in a breathtaking array of colors—pinks, purples, yellows, oranges, and even deep, rich burgundies and nearly black.
- Garden Versatility: They look fantastic as focal points, in mass plantings, or nestled among other perennials. Their upright form adds vertical interest.
- Sense of Accomplishment: Successfully growing and overwintering these beautiful plants in your Zone 7 garden brings immense satisfaction!
Embracing the challenge of growing these tender perennials outdoors is a rewarding experience that enriches your gardening journey.
Frequently Asked Questions About Calla Lilies in Zone 7
We get a lot of questions about growing these beauties! Here are some common queries to help you further.
Can I leave calla lilies in pots outside over winter in Zone 7?
While technically possible with heavy insulation, it’s generally *not* recommended. Potted plants are more exposed to freezing temperatures than those in the ground, and the soil in pots freezes solid more easily. For best results, bring potted calla lilies indoors to a cool, dark, frost-free location for winter, or dig up the rhizomes and store them as described in the “Dig and Store” method.
How long do calla lilies bloom in Zone 7?
With proper care and adequate sunlight, calla lilies typically bloom from late spring through mid-summer, often lasting several weeks to a couple of months. Deadheading spent blooms can encourage the plant to produce more flowers.
Are calla lilies toxic to pets or children?
Yes, calla lilies are considered toxic if ingested. They contain calcium oxalate crystals, which can cause irritation to the mouth, throat, and digestive tract. It’s always a good idea to plant them in areas where curious pets or children won’t easily access them, and to wear gloves when handling the rhizomes or sap, as it can cause skin irritation in some individuals.
What’s the difference between white calla lilies and colored calla lilies regarding hardiness?
Generally, the classic white calla lily (Zantedeschia aethiopica) tends to be slightly more tolerant of colder temperatures than the colorful hybrids (e.g., Zantedeschia elliottiana, Zantedeschia rehmannii, and their crosses). While the white varieties are sometimes listed as hardy to Zone 8, and occasionally survive in Zone 7 with heavy mulching, the colorful types almost always require digging and storing in Zone 7 for reliable return.
Can I start calla lilies from seed in Zone 7?
Yes, you can start calla lilies from seed, but it’s a much slower process than planting rhizomes. Seeds can take several weeks to germinate, and the resulting plants may take 2-3 years to reach blooming size. For immediate gratification and reliable blooms, planting rhizomes is the preferred method for most gardeners.
Conclusion: Embrace the Beauty of Calla Lilies in Your Zone 7 Garden!
There you have it, fellow gardeners! Growing calla lilies outside in Zone 7 is not just a possibility; it’s a rewarding adventure. By understanding their needs for sun, well-draining soil, consistent moisture, and—most importantly—strategic winter protection, you can enjoy their breathtaking beauty year after year.
Don’t let the “tender perennial” label intimidate you. With the detailed advice from this
can calla lilies be planted outside in Zone 7 guide
, you’re now equipped with the expertise to cultivate these elegant flowers with confidence. So, go ahead, select your favorite varieties, get your hands dirty, and prepare to be amazed by the sophisticated charm calla lilies will bring to your Greeny Gardener haven. Happy planting!
