Plant Calla Lily Bulbs Outdoors: A Comprehensive Guide to Success

Introduction

Calla lilies, with their elegant trumpet-shaped blooms and lush foliage, add a touch of sophistication to any garden. If you’re yearning to witness their beauty in your outdoor oasis, planting calla lily bulbs is an easy and rewarding endeavor. This comprehensive guide will lead you through the process step-by-step, ensuring flourishing calla lilies in your garden.

Choosing the Right Bulbs

1. Species and Varieties

There are two main species of calla lilies: Zantedeschia aethiopica (White Calla Lily) and Zantedeschia rehmannii (Colored Calla Lily). Within these species, numerous varieties exist, each offering unique colors, sizes, and bloom times.

2. Bulb Size and Health

Select healthy, firm, and disease-free bulbs. Larger bulbs (over 2 inches in diameter) generally produce more flowers than smaller ones.

Site Selection and Preparation

1. Location

Callas prefer full sun to partial shade. Choose a spot with well-drained soil that does not become waterlogged.

2. Soil Preparation

Calla lilies thrive in fertile, slightly acidic soil (pH range of 5.5 to 6.5). Amend the soil with organic matter such as compost or peat moss to improve drainage and nutrients.

Planting Calla Lily Bulbs

1. Planting Depth and Spacing

Plant the bulbs pointy end up, about 4-6 inches deep and 6-8 inches apart. The depth may vary depending on the bulb size and soil type.

2. Watering

Water the soil thoroughly after planting. Avoid overwatering, as calla lilies are susceptible to root rot.

Care and Maintenance

1. Watering

Keep the soil consistently moist during the growing season, especially in hot, dry weather. Avoid waterlogging, which can lead to bulb rot.

2. Fertilizing

Fertilize calla lilies monthly with a balanced liquid fertilizer (such as a 10-10-10 formula) during the growing season.

3. Deadheading

Remove faded blooms regularly to promote continuous flowering and prevent seed formation.

Winter Care

After the first frost, allow the foliage to die back naturally. Cut back the stems, leaving about 2 inches above the bulb.

1. Cold-Hardy Zone 8 and Above

In warmer climates, calla lilies can be left in the ground for winter. Mulch heavily with organic matter, such as shredded leaves or straw, to protect the bulbs from cold temperatures.

2. Cold-Hardy Zone 7 and Below

In colder climates, dig up the calla lily bulbs in fall. Store them in a cool, dry place until the following spring.

Tips for Success

• Start bulbs indoors 6-8 weeks before the last frost in cold climates.
• Protect new sprouts from frost by covering them with a cloth or frost blanket.
• Avoid planting calla lilies in heavy clay or acidic soil.
• Control pests and diseases promptly to prevent damage.
• Calla lilies are deer resistant, making them a great choice for areas prone to deer browsing.

Conclusion

Planting calla lily bulbs outdoors is a rewarding project that adds beauty and elegance to any garden. By following these comprehensive instructions and providing the proper care, you can enjoy the vibrant blooms of calla lilies season after season.