How to Grow Alstroemeria in Washington

Alstroemeria, commonly known as the Peruvian lily or lily of the Incas, is a stunning perennial flower that adds vibrant colors and exotic beauty to gardens. With their long-lasting blooms and variety of colors, these flowers are a favorite among gardeners. If you live in Washington State and want to grow Alstroemeria, you’re in luck! This guide will walk you through the steps needed to successfully cultivate this beautiful plant in your garden.

Understanding Alstroemeria

Alstroemeria belongs to the Alstroemeriaceae family and originates from South America. These hardy plants thrive in well-drained soil and can withstand a range of climates, making them suitable for growth across various regions, including Washington. The flowers bloom from late spring through summer, providing a splash of color when many other plants have finished flowering.

Varieties of Alstroemeria

Before planting, it’s important to know the different varieties available. Some popular types include:

• Alstroemeria aurea: Known for its bright orange-yellow flowers.
• Alstroemeria hybrid: These hybrids often produce larger blooms and come in various colors, including purple, pink, and white.
• Alstroemeria psittacina: Characterized by its unique red and green flowers resembling a parrot.

Selecting a variety that thrives in your specific location will help ensure a successful growing season.

Choosing the Right Location

The first step in growing Alstroemeria is selecting an appropriate location in your garden. Here are some factors to consider:

Sunlight Requirement

Alstroemeria prefers full sun but can tolerate partial shade. Aim for at least six hours of direct sunlight per day for optimal growth. In Washington, where cloudy days can be common, positioning your plants in the sunniest spot will enhance their blooming potential.

Soil Quality

Alstroemeria thrives in well-draining soil. Sandy loam is ideal; however, you can amend clay soils with compost or sand to improve drainage. Conducting a soil test will help you determine the pH level and nutrient content, ensuring that you can make necessary adjustments before planting.

Protection from Wind

Since Washington can experience strong winds, it’s important to choose a location that offers some protection. Planting near a fence or using windbreaks will help shield your Alstroemeria and allow them to flourish.

Preparing the Soil

Once you’ve selected your planting location, it’s time to prepare the soil:

1. Clear the Area: Remove any weeds, rocks, or debris from the planting site.
2. Till the Soil: Use a garden fork or tiller to break up compacted soil to at least 12 inches deep.
3. Add Organic Matter: Mix in organic compost or well-rotted manure to enrich the soil with nutrients while improving drainage.
4. Test pH Levels: Ideally, Alstroemeria prefers slightly acidic to neutral pH (6-7). Adjust with lime (to raise pH) or sulfur (to lower pH) as needed.

Planting Alstroemeria

After preparing your soil, it’s time to plant:

When to Plant

The best time to plant Alstroemeria in Washington is during spring after the last frost date (usually mid-April), or you can also plant in early fall (September) for better root establishment before winter.

Planting Steps

1. Dig Holes: Dig holes that are about 12 inches apart and deep enough to accommodate the roots of the plants.
2. Place Rhizomes: If you’re planting rhizomes (the underground stems), place them horizontally about 3 inches deep.
3. Cover with Soil: Fill in around the rhizomes with soil, pressing down gently to eliminate air pockets.
4. Water Thoroughly: After planting, water deeply to help settle the soil around the roots.

Watering Guidelines

Proper watering is crucial for healthy Alstroemeria growth:

• Initial Watering: Water thoroughly after planting.
• Regular Schedule: Maintain consistent moisture during their growing season but avoid overwatering. The top inch of soil should be allowed to dry out between waterings.
• Drought Tolerance: Once established, Alstroemeria is relatively drought-tolerant but still benefits from regular watering during dry spells.

Fertilizing Your Plants

To promote vigorous growth and blooming:

• Type of Fertilizer: Use a balanced fertilizer with equal parts nitrogen, phosphorus, and potassium (NPK).
• When to Fertilize: Fertilize once in early spring as new growth appears and again during mid-summer when blooming starts.
• Application Method: Follow package instructions for application rates; avoid over-fertilizing as this can damage roots.

Pruning and Maintenance

Proper maintenance will keep your Alstroemeria plants healthy and flourishing:

Deadheading

Remove spent flowers regularly throughout the blooming period to encourage new blooms and prevent seed formation.

Fall Cleanup

After frost has killed off foliage in late fall:

1. Cut back stems near ground level.
2. Remove any debris around the base of the plants to prevent disease.

Mulching

Apply a layer of organic mulch around your plants after they are established. Mulch helps retain moisture, suppress weeds, and regulate soil temperature.

Pest and Disease Management

Although generally hardy, Alstroemeria can still be susceptible to pests and diseases:

Common Pests

• Aphids: Small green insects that can be controlled with insecticidal soap or neem oil.
• Spider Mites: Thriving in dry conditions; increase humidity or spray foliage with water.

Diseases

• Fungal Diseases: Root rot may occur if overwatered; ensure adequate drainage and air circulation.
• Leaf Spot Diseases: Remove affected leaves promptly and avoid overhead watering.

Winter Care

In Washington’s colder climates:

1. Apply a thick layer of mulch around plants before winter sets in.
2. In areas prone to freezing temperatures, consider covering your plants with burlap or frost cloth if severe cold is expected.

Propagation of Alstroemeria

If you wish to expand your garden without purchasing more plants:

1. Division: The easiest method is dividing established clumps every two to three years in spring or fall.
2. Carefully lift out clumps using a garden fork.
3. Divide into sections ensuring each has roots attached before replanting them at desired locations.

Conclusion

Growing Alstroemeria in Washington can be an incredibly rewarding experience due to their stunning blooms and adaptability to various conditions. With proper care—selecting suitable varieties, preparing your soil adequately, watering responsibly, managing pests and diseases effectively—you’ll enjoy a beautiful display of colorful blossoms year after year. Whether incorporated into flower beds or used as cut flowers indoors, these captivating plants will enhance any landscape setting you create!