How to Grow Bigleaf Lupine Plant Outdoors

Bigleaf Lupine (Lupinus polyphyllus) is a stunning perennial plant known for its tall spires of colorful flowers that bloom in shades of purple, blue, pink, and white. This plant is a favorite among gardeners for its beauty and ability to attract pollinators like bees and butterflies. If you’re looking to add some vibrant color to your outdoor garden, consider growing Bigleaf Lupine. Here’s a comprehensive guide on how to successfully grow this plant outdoors.

Choosing the Right Location

Bigleaf Lupine thrives in full sun to partial shade conditions. When selecting a location for planting, choose a spot that receives at least 6-8 hours of sunlight per day. Ensure that the soil is well-draining to prevent waterlogging, as Bigleaf Lupine does not tolerate wet feet.

Soil Preparation

Before planting Bigleaf Lupine, it’s essential to prepare the soil properly. This plant prefers rich, slightly acidic soil with a pH level between 6.0 and 7.0. Amend the soil with organic matter such as compost or well-rotted manure to improve drainage and fertility.

Planting Bigleaf Lupine

Bigleaf Lupine can be planted from seeds or nursery-bought plants. Here’s how to plant them:

1. From Seeds:
2. Start seeds indoors 6-8 weeks before the last frost date in your area.
3. Sow the seeds on the surface of moist soil and lightly press them down.
4. Keep the soil consistently moist until seedlings emerge.

5. Transplant seedlings outdoors after the danger of frost has passed.

6. From Nursery Plants:

7. Dig a hole twice as wide and deep as the plant’s root ball.
8. Place the plant in the hole and backfill with soil.
9. Water thoroughly after planting to help establish roots.

Watering and Maintenance

Bigleaf Lupine requires regular watering, especially during dry periods. Water deeply once a week, allowing the soil to dry out slightly between waterings. Mulching around the base of the plant can help retain moisture and suppress weed growth.

Deadhead spent flowers regularly to encourage continuous blooming and prevent self-seeding. In early spring, cut back the plant to promote new growth and maintain its shape. Fertilize Bigleaf Lupine with a balanced fertilizer in the spring to support healthy growth.

Dealing with Pests and Diseases

While Bigleaf Lupine is relatively pest-resistant, it can be susceptible to aphids, slugs, and powdery mildew. To deter pests, inspect plants regularly and remove any affected parts. Apply neem oil or insecticidal soap as necessary.

To prevent powdery mildew, ensure good air circulation around plants by spacing them appropriately. Avoid overhead watering, as damp foliage can contribute to fungal diseases.

Supporting Tall Plants

Bigleaf Lupine can grow quite tall, reaching heights of 3-4 feet or more. To support these tall plants and prevent them from flopping over, stake them early in the growing season. Use tall stakes or garden cages and tie the stems gently for support.

Propagation

Bigleaf Lupine can be easily propagated through division or by collecting seeds from mature plants. Divide established clumps in early spring or fall by carefully separating the roots and replanting divisions in suitable locations.

Collect seeds from dried seed pods in late summer or fall, sow them in prepared soil, and keep them consistently moist until germination occurs.

Conclusion

With its striking flowers and attractive foliage, Bigleaf Lupine is a fantastic addition to any outdoor garden. By following these guidelines on choosing the right location, preparing the soil, planting properly, providing care and maintenance, dealing with pests and diseases, supporting tall plants, and propagating successfully, you can enjoy the beauty of Bigleaf Lupine in your garden for years to come. So roll up your sleeves, get your gardening tools ready, and start growing your very own Bigleaf Lupine plants outdoors today!