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Complete Guide to Plant, Grow and Care for Lupine Flowers

Tips for growing striking, drought-tolerant lupine from seeds and cuttings.

Growing Lupine

If you’re searching for an eye-catching, summer-blooming perennials that will stand out from the crowd, lupine is a definite bet.

Striking ​plants have stiff, erect flower spikes — 1 to 4 feet tall — that emerge from horizontal foliage. ​Flowers are similar to those of peas or sweet peas and grow in large, ​densely packed​ racemes​ of deep blue, purple, yellow, pink, or white.​

A short-lived perennial, lupine is found from California to British Columbia. Plants do not require a lot of care. Give them a sunny spot, ample water, and well-drained soil and you’ll be hearing oohs and aahs for seasons to come.

Lupines make ​a terrific addition to borders, xeric (water conserving) gardens, or scattered throughout native landscapes.

Depending on the variety and your zone, lupine flowers will bloom from late spring through the first weeks of July.

As a result, we recommend planting them with some late-blooming, summertime favorites — zinnia, rudbeckia, daisies — to keep the color going well into fall.

Plants are deer-resistant ​and ​their flowers attract many important pollinators like bees, butterflies, and hummingbirds.

 

Botanical Name: Lupinus

Family: Fabaceae

Plant type: Herbaceous, perennial, annual

Hardiness zones: 4-8 (USDA)

Sun exposure: Full sun to light shade

Soil type: Rich, moist, well-drained

Bloom time: late spring to early or midsummer.

Maturity: Days to bloom varies depending on fall or spring planting; blooms July-August

Height: 1 to 4 feet, depending on variety

Spacing: 12 inches

Flower color: Purple, blue, yellow, pink, and white.

Quick Guide: Planting, Growing & Caring for Lupine

  1. Purple color is most common, but blue, yellow, pink, and white varieties are also available
  2. Prefers cooler regions with average soil
  3. Plant in full sun to light shade; loosen soil for long taproot to grow
  4. Plant chilled seed in spring otherwise, fall planting is preferred for seed and plants
  5. Transplanting is not recommended
  6. Blooms late spring to mid-summer

Lupine Care

Lupines are members of the Lupinus genus, which belongs to the Fabaceae family of plants. The genus has more than 199 species.

They are referred to as ‘lupin’ plants and are also known as ‘bluebonnets’ in some areas.

Lupine hybrids (Lupinus hybrida) are commonly grown in gardens across the country and are bred to maximize flower color.

The most popular hybrid lupines for gardens were created by crossing Lupinus polyphyllus, a North American native, with many other species, including Lupinus arboreus.

Domesticated lupines come in a variety of colors, including blues, yellows, pinks, and purples, in contrast to the blues and whites found in wild lupines.

They are valued not only for their beauty, but also for their ability to grow in harsh conditions, such as sandy soils with few nutrients, high elevations, and places with cool summers.

In fact, lupines are members of the pea family, making them legumes that are nitrogen-fixing and can improve ​your soil’s fertility over time.

Light

Lupines grow and bloom best in full sun, with at least six hours of direct sunlight on most days.

They can tolerate mild shade, although blooming will be reduced. In hot climates, though, some afternoon shade is preferable.

Lupines seldom blossom if they are planted in heavy shade. Trim back nearby bushes and trees to enable some sunlight to reach the lupines in shaded areas.

Soil

Lupines prefer cool temperatures and moist, sandy, well-drained soil. They grow best in soil with a pH that is neutral to slightly acidic, but they can also grow in very acidic soil.

Water

Keep the soil evenly moist after planting lupines to encourage good root development. But remember that lupines don’t prefer soggy moil as overwatering can lead to root rot.

Your plants will be able to survive drier conditions once they have established a strong root system and will only need to be watered during periods of drought

Temperature and Humidity

Lupines prefer climates with fairly cool summers and don’t do as well in hot, humid conditions, like that of the Southern part of the United States.

Plants that are exposed to a lot of heat and direct sunshine may not be able to flower.

When growing in hot climates, make sure to place a light layer of mulch around the lupines to help its soil retain moisture which can keep the roots cool

Fertilizer

Lupines can absorb nitrogen directly from the atmosphere, therefore plants may thrive on nitrogen-deficient soil without the need for additional fertilizer. In fact, too much fertilizer may lead to excessive foliage growth instead of flowers blooming.

An acidifying fertilizer, on the other hand, can be helpful in decreasing the pH of alkaline soils to help lupines grow better.

Pruning and Deadheading

Deadhead your plants, i.e., remove spent flowers, to encourage a second bloom in early fall, especially if you live in an area with cool summers. Perennial species of lupines can be pruned down to the ground as the foliage begins to yellow at the end of the season.

How to Plant and Grow Lupines

Lupines are herbaceous perennial plants and can be grown from seeds, cuttings, or divisions. Each year, the lupine’s foliage dies back to the ground, and new growth emerges from the roots below in the spring.

With the right lighting, lupines can also be grown indoors in containers. To learn more about how to grow plants indoors, check out our complete indoor gardening guide.

Site Preparation

Easy to grow, lupine thrives in cool, moist locations. It prefers full sun to light shade and average soils, but will tolerate sandy, dry soil. Plants develop long taproots, so loosen the soil to a depth of 12-20 inches using a rototiller or garden fork. They will not grow in clay.

How to Grow Lupines from Seed

If growing from seed, germination is greatly increased by a 7-day cold treatment (see our article on Seed Stratification). Place seeds and slightly damp paper towels in a Ziploc bag and store them in the refrigerator.

Another method would be to soak them in warm water for a 24-hour period. Treated seeds can be directly sown into a seedbed in spring or summer until August 1st.

Sow seeds at a shallow depth of about 1/4 inch beneath loose topsoil, and 12 inches apart, and keep them evenly moist until the seeds germinate. Seedlings should emerge about 15 to 25 days after planting.

The best time to plant untreated lupine seeds outdoors is between September-November.

Plants grown from seed will bloom in their first year. Pinch off spent flowers to prolong the blooming period. Apply an organic fertilizer once per month to promote healthy plants and large blooms.

Tip: For dramatic results, mass lupines in borders or scatter them throughout the cottage garden. Visit our Flower Gardening 101 article for more information.

Propagating Lupines

To grow from cuttings, take a stem down to the trunk, including a bit of its “footprint” connection to the trunk. Set in moist, very well-drained, gritty sand or other propagation mediums.

Keep covered during the propagation period except for several minutes each day to air and allow the plant to adjust.

Start cuttings in larger pots that can be transplanted into the outdoors, pot and all, so as not to disturb the roots.

Do NOT transplant as the long tap root is delicate, and if damaged, the plant will fail.

Seed Saving Instructions

Ripe seed pods naturally explode. When the pods begin to turn yellow and the seeds ‘rattle’ inside, they are ripe. Place in a screen box where they can burst freely and simply pick up the seed. Read more about saving seeds here.

Common Pests & Plant Disease Problems

Lupines are vulnerable to aphids in spring, as well as slugs and snails. When found, respond to pests with horticultural oils as soon as possible.

When it comes to aphids, here’s the least-toxic approach to pest control:

  • Pinch or prune off heavily infested leaves or other plant parts.
  • Get commercially available beneficial insects, like ladybugs, as they are important natural predators of the pest.
  • Apply organic Diatomaceous Earth (DE)for lasting protection. Containing NO toxic poisons, DE works by scoring an insect’s outer layer as it crawls over the fine powder.
  • A short-lived natural pesticide, Safer® Soapworks fast on heavy infestations.
  • Do not over-fertilize – aphids like plants with high nitrogen levels and soft new growth.

Brown spot fungus can affect lupines, causing brown patches to appear on different areas of the plant.

When that happens, eliminate and kill all infected plants, and refrain from cultivating lupines in that location for at least a few years to give the spores enough time to die off.

Powdery mildew can also affect lupines, particularly if there isn’t good air circulation around the plants.

This fungal disease causes white, powdery areas on the leaf, and it may be controlled using a variety of chemical and organic techniques. You may, alternatively, cut the foliage away and wait for it to regrow.

 

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