Desert Lupine: A Guide for Gardeners
Introduction
Desert lupine, also known as Coulter’s lupine, is a beautiful wildflower that thrives in the southwestern United States and parts of northern Mexico. This nectar-rich plant attracts a variety of pollinators, including honeybees and bumblebees. In this article, we will explore the desert lupine plant, its growth requirements, and how to care for it in your garden.
Desert Lupine Characteristics
Desert lupine is a member of the pea family and is characterized by its dark green, palmate leaves and spikes of blue or purple, pea-like flowers. It typically grows to a height of 18 inches, but can reach up to 4 feet tall. Desert lupine plants bloom prolifically in moist years, creating a colorful carpet in the desert. Even in dry years, this hardy plant will bloom and can often be found growing along roadsides.
Growing Desert Lupine Plants
When growing desert lupines, well-drained soil is essential. These plants do not tolerate clay soil. They prefer full sunlight, but can tolerate light shade, which can be beneficial during hot afternoons. Desert lupine seeds can be planted directly outdoors in the fall or stratified (pre-treated) and planted in early spring. Before planting, rub the seeds lightly with sandpaper to break through the hard outer coating. You can also soak the seeds in warm water overnight. Loosen the soil before planting to allow space for the long taproot, and cover the seeds with about 1/2 inch of soil. Water sparingly until the seeds have germinated.
Desert lupine plants do not like to have their roots disturbed and do not transplant well. Therefore, it is important to plant them where you want them to remain.
Desert Lupine Plant Care
Desert lupine seedlings are slow growers. Water them lightly as needed and protect them from frost. Once mature, desert lupine plants are drought tolerant. However, they will benefit from occasional irrigation during dry weather. Feed desert lupines lightly once per month during the growing season using a general-purpose fertilizer. Like other lupine plants, they fix nitrogen in the soil, making them good companions for nitrogen-loving plants. To encourage prolific blooming throughout the season, pinch wilted flowers.
Additional Tips for Growing Desert Lupines
- Choose a planting site with well-drained soil and full sun or light shade.
- Plant seeds in the fall or early spring after stratification.
- Water sparingly and protect seedlings from frost.
- Once established, desert lupines are drought tolerant but will benefit from occasional irrigation.
- Fertilize lightly once per month during the growing season.
- Pinch wilted flowers to encourage continued blooming.
With proper care, desert lupine plants will thrive in your garden, providing a beautiful and beneficial addition to your landscape.