Stanleya pinnata (Desert Prince's Plume)

Stanleya spp.

desert plume

Attracts Pollinators Attracts Butterflies Deer Resistant Drought Tolerant

HardinessZones 4–9

Overview

Stanleya is a genus of about six to seven species in the mustard family (Brassicaceae), native to the arid and semi-arid interior of western North America. Plants range from herbaceous perennials to subshrubs woody at the base, growing 2-5 feet (60-150 cm) tall on erect, often glaucous blue-green stems. The lower leaves are pinnately lobed to entire, while upper leaves are smaller and clasping. Flowers are borne in elongated terminal racemes 6-24 inches (15-60 cm) long; each has four narrow yellow to cream petals and four long protruding stamens, producing a feathery, plume-like spike that gives the group its common name, desert plume. Several species, including S. pinnata, accumulate selenium from soils and can be toxic to grazing livestock when eaten in quantity. After flowering, slender curved seed pods (siliques) 1-3 inches (2.5-7.5 cm) long hang from the stalk. Stanleya occupies open desert flats, washes, and rocky slopes across the Great Basin, Mojave, and Colorado Plateau. The genus needs sharp drainage and tolerates alkaline, gypsum, and selenium-bearing soils that exclude many other perennials, though it is short-lived where summer irrigation or heavy soils keep the roots wet.

Native Range

Native to western North America, Stanleya ranges across the Great Basin, Mojave Desert, and Colorado Plateau, extending from eastern Oregon and Idaho south to Arizona, New Mexico, and northern Mexico. Most species grow on arid flats, desert washes, and rocky or gypsum slopes, frequently on selenium-rich substrates.

Suggested Uses

Stanleya is used in dry gardens, rock gardens, and native plantings in arid and semi-arid regions, where it suits gravel beds and unirrigated slopes. Its tall yellow racemes appear in wildflower and pollinator plantings on alkaline soils. It is not suited to humid climates or regularly watered borders.

How to Identify

Recognize Stanleya by its tall, erect raceme of yellow to cream four-petaled flowers with four long, projecting stamens that give the spike a plume-like outline. The stems and foliage are usually glaucous blue-green, with pinnately lobed lower leaves and smaller clasping upper leaves. Slender curved seed pods 1-3 inches (2.5-7.5 cm) long stand out from the stalk on thin stalks. The combination of desert habitat, selenium-soil association, and feathery yellow plumes separates it from other mustard-family genera.

Appearance

Size & Dimensions

Height2' - 5'

Width/Spread1' - 2'

Colors

Flower Colors

Foliage Colors

Bloom Information

Bloom Period

~6 weeks

Spring Summer

Across the genus, flowering runs from late spring into summer, generally April through July depending on elevation and rainfall. Bloom opens from the base of the raceme upward over several weeks, so a single spike carries open flowers, buds, and developing pods at once. In dry years flowering is brief, while wetter springs extend it.

Detailed Descriptions

Flower Description

yellow to cream

Foliage Description

blue-green

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-12 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range7.0 - 8.5(Alkaline)

357912

Soil Types

sand rocky loam

Drainagewell drained

Water & Climate

Water Needs

Very Low

Frost Tolerance

hardy

Time to Maturity

2-3 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Stanleya requires full sun and sharp, fast-draining soil; it grows naturally on sandy, gravelly, gypsum, and alkaline substrates. Water needs are very low once established, and plants are adapted to long dry summers. Excess irrigation, rich soil, or poor drainage shortens their life and promotes root rot. Most species tolerate soil pH from about 7.0 to 8.5 and withstand heat and reflected sun. Hardiness spans roughly USDA zones 4-9 across the genus, with cold tolerance varying by species and provenance. Plants form a deep taproot and transplant poorly, so they are usually grown from seed sown where they are to remain.

Pruning

Pruning is minimal. Spent flower stalks can be cut back after seed set to limit self-sowing, and dead basal growth removed in early spring. Subshrubby species may be trimmed lightly to shape, but they regenerate slowly and tolerate little hard cutting.