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Rocky Mountain bee plant, a spidery pink-purple flower head with long stamens

Plant profile

Rocky Mountain Bee Plant

Cleome serrulata

The pollinator magnet Native Americans called the “fourth sister.”

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Native near you?

Highlights

Rocky Mountain bee plant is a tall, showy native annual that erupts in clusters of pink-to-purple blooms from midsummer into fall. The nectar-rich flowers are a magnet for bees, butterflies, and hummingbirds. It’s not unusual to see dozens of pollinators working a single plant at once. This drought-tolerant plant thrives in full sun and well-drained soil, making it ideal for western gardens, xeriscaping, and pollinator plantings. It’s a larval host for the checkered white butterfly, freely reseeds year after year, and deer and rabbits leave it alone.

Is Rocky Mountain bee plant a good choice for my yard?

Yes, if…

Rocky Mountain bee plants blooming pink-purple across a green prairie
Rocky Mountain bee plants are known as colonizer plants: they show up first in disturbed sites

Skip it if…

Spidery pink flower head with long seed pods on a spiny stem, red leaves behind
Be sure to get up close: there are multiple levels of petals, leaves, and seeds to take in (and some spider webs, in this photo)

The Tewa and other southwestern tribes grew it alongside corn, beans, and squash as a “fourth sister,” specifically because it attracted pollinators to the food garden.

Why Rocky Mountain bee plant matters

Rocky Mountain bee plant is one of the western U.S.’s most important native pollinator plants. Researchers in Utah’s Grand Staircase-Escalante found that Cleome was among the top “magnet” genera, hosting 75% of all pollinators collected. Bees of all kinds, butterflies, wasps, and hummingbirds cover the blossoms.

It’s also a host plant

It’s also a larval host for the checkered white butterfly, and its seeds feed mourning doves, quail, and small mammals. Because it colonizes disturbed ground quickly, it plays a key role in stabilizing soil and outcompeting invasive weeds in restoration projects.

This plant also has deep cultural roots. The Tewa and other southwestern tribes grew it alongside corn, beans, and squash as a “fourth sister,” specifically because it attracted pollinators to the food garden. The Navajo still use it to produce yellow-green dye for wool rugs, and Pueblo potters boil the plant into a thick black resin to paint designs on pottery, a tradition stretching back to the Ancestral Puebloans over 700 years ago.

Where is Rocky Mountain bee plant native?

Native to 18 US states and 4 Canadian provinces (Alberta, British Columbia, Manitoba, Saskatchewan)

Native range
Not native

Sources: NatureServe, Royal Botanic Gardens, Kew (World Checklist of Vascular Plants) and the USDA PLANTS Database, compiled by The Plant Native. How we map native ranges

Where Rocky Mountain bee plant shines in your yard

Rocky Mountain bee plant, purple flower heads on tall stems in dry grass
Group Rocky mountain bee plants today for maximum garden drama

How to grow Rocky Mountain bee plant

Where to plant

Full sun is best, though it tolerates light shade. Prefers well-drained, sandy or loamy soil but adapts to a range of soil types, including poor or alkaline soils. Avoid heavy clay or waterlogged sites.

When to plant

Sow seeds directly outdoors in late fall (the easiest method). Winter cold naturally breaks seed dormancy. For spring sowing, cold-stratify seeds first: mix with moist sand and refrigerate for 30 days before planting.

Seed planting depth: Barely cover seeds or press them into the soil surface. They need some light to germinate. Expect germination in 2–5 weeks once soil warms.

Planting card

Rocky Mountain Bee Plant

Cleome serrulata

Watering

Water lightly until seedlings establish. Mature plants are drought-tolerant and rarely need supplemental water.

Spacing

Space plants or thin seedlings to 12–18 inches apart. In a meadow planting, scatter seed and let nature sort it out.

Cutting back

Not much to do here. You can pinch growing tips early in the season to encourage bushier growth. Deadhead spent flower clusters if you want to limit self-seeding and wilder growth. After frost kills the plant, pull or cut the stems and leave the roots to decompose in place.

Beginner tip

When shopping, make sure you’re buying Cleome serrulata (the native) and not Cleome hassleriana (often sold as “cleome” or “spider flower”). C. hassleriana is a South American species that looks similar but provides far less value for native wildlife. Easy ID comes from the leaves: the native has three leaflets per leaf; the tropical one has five to seven. If you see five or more leaflets, put it back.

What pairs well with Rocky Mountain bee plant?

Pair Rocky Mountain bee plant with other sun-loving, drought-tolerant western natives that thrive in well-drained soil. Firewheel, black-eyed Susan, prairie coneflower, penstemons, globe mallow, and native buckwheats all share similar growing conditions. The goal is a planting that offers something for pollinators from early summer through fall and holds up in dry, sunny spots.

Where can I buy Rocky Mountain bee plant?

Most big-box garden centers don’t carry true natives, but Rocky Mountain bee plant is easier to find than you might think. Your best bets are a native plant nursery near you, a native plant society sale, or a trusted online grower that ships to your region.

FAQs

Does Rocky Mountain bee plant come back every year?

It’s an annual, so each plant lives one season. But it reseeds prolifically, so new plants return year after year without replanting.

Can I eat Rocky Mountain bee plant?

Yes, it has a long history as a food plant. Young shoots and leaves can be cooked as greens (high in vitamin A and calcium), and seeds can be ground into flour. The raw plant is bitter and pungent, though. Maybe better for your pollinator garden than your lunch.

Why aren’t my seeds germinating?

Almost certainly a cold stratification issue. Rocky Mountain bee plant seeds need 30+ days of moist cold to break dormancy.

Sow in fall for best results, or refrigerate seeds in moist sand before spring planting. Also ensure seeds aren’t buried too deep, because they need light.

Plant nerd fact

Indigenous peoples have used Rocky Mountain bee plant for millennia.

Rocky Mountain bee plant seeds have been found in archaeological sites across the Southwest dating back over a thousand years, and the plant was so valued as a food, dye, and pollinator attractant that some tribes actively cultivated it, making it one of the few native annuals deliberately grown in pre-contact North America. Lewis and Clark collected it along the Vermillion River in South Dakota in August 1804, making it one of the first western native plants documented by the expedition. But by then, Indigenous peoples had already been cultivating it for centuries.

There are some native plants that come with it all: beauty, fuss-free gardening, and a great backstory. Rocky Mountain bee plant is one of these plants. Although they last for only a year, they reseed when happy and return in future years just when pollinators need them. Be sure to tell your friends and neighbors how important this plant is and was to the Navajo, Tewa, and Ancestral Puebloan tribes. Maybe even give it as a garden nametag, with the name “fourth sister,” alongside your corn, beans, and squash. Give away lots of seeds in the fall so others can grow their own Rocky Mountain bee plants, too.

Where to next? If you’re into an edible theme, we highly recommend Best Edible Native Plants. Or keep focused on other host plants and visit Best Native Host Plants for Butterflies. Happy planting!

Written by

Becky Band Jain

Contributor

By day, Becky is a strategic communications consultant. In her free time, she’s an active member and former VP of the Wild Ones Nation’s Capital Chapter, converting her Maryland yard to natives and mobilizing her community to do the same.

Sources

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