2025 Native Plant of the Year: Chamaecrista fasciculata (Partridge Pea)

What is Chamaecrista fasciculata?

A complex name for a complex plant (pronounced kam-ee-KRIS-tuh fa-sik-yoo-LAY-tuh).

This aggressively self-seeding annual with its own circadian rhythm may sound like something out of Little Shop of Horrors but it is, in fact, our 2025 Native Plant of the Year.

Also known as Sensitive Plant, its circadian rhythm causes the yellow, buttercup-like flowers to fold in on themselves as the sun sets and gently open again as the sun rises.

Chamaecrista fasciculata is also known as senna, cassia, and – my personal preference – Patridge Pea.

‘Partridge’ for its role as major food source for quail, pheasant, mallard, prairie-chicken, and grassland birds. And ‘pea’ for its value as a nitrogen-fixing member of the legume family.

What is Partridge Pea good for?

Seemingly every aspect of Chamaecrista fasciculata serves a beneficial purpose, which might explain why I’m asked for Patridge Pea seeds more than those of any other plant.

• Patridge Pea flowers

Billows of yellow blossoms, blooming from July until first frost, create a vibrating wall of bees you can hear from thirty feet away.

Its flowers attract a variety of long-tongued bees that are suited to reach deep into the ‘buttercups’ for pollen: leaf-cutters, honey bees, bumble bees and long-horned bees to name a few.

• Patridge Pea greens

Soft and delicate-looking, Partridge Pea leaves and stems provide their own value. The stems produce nectar, attracting a different set of beneficial insects. The common sulfur butterfly lays its eggs on the leaves, and its larvae use the leaves as a food source.

Likewise, the greenery provides delicious browse for deer (see our article on Deer Proof Gardening... spoiler: Partridge Pea is not deer-proof), making it a self-generating sacrificial plant.

• Patridge Pea roots

As a member of the legume family, Partridge Pea is a nitrogen-fixer that fertilizes the soil pulling nitrogen gas from the air and converting it into a nutrient usable by other plants.

With both a central taproot and a fibrous secondary root system, Patridge Pea is surprisingly (and satisfyingly) easy to pull from the ground where not desired, allowing you to manage spread before re-seeding.

How Partridge Pea performed in 2025

Partridge Pea behaves consistently year to year, providing three seasons of interest. Due to the higher-than-average rain fall in Maryland in 2025, Patridge Pea had a banner year, blooming longer and more prolifically than we’ve seen in the past.

Spring quiet

Slower to emerge, Patridge Pea’s fern-like greens poke their heads out by late Spring.

Easy to remove where not wanted, they’re even easier to remove if you allow the stems to mature enough to withstand pulling. If pulled too young, the stems may break leaving roots intact for regrowth.

Summer billows

Summer is when Patridge Pea really shines with a long bloom period, lasting from early Summer ‘til frost, providing a consistent, reliable, and seemingly irresistible pollen source for bees even during hot periods.

Fall bursts

The fireworks begin in mid-September, when green seed pods ripen to brown and burst open.

Via “ballistic seed dispersal”, Partridge Pea pods propel their seeds up to 5’ away (see North Carolina Extension Gardner's plant profile for more detail, including even more common names for chamaecrista fasciculata).

Winter interest

I leave the stalks standing, for structure and shelter for overwintering birds and bugs, and they look amazing after a winter snow.

The hard shell protecting these protein-rich seeds rich in make Partridge Pea seeds a viable winter food source for birds through March.

Chamaecrista fasciculata – aka Patridge Pea – is our 2025 Native Plant of the Year.

*Get your free Chamaecrista fasciculata seed packet with your next order, while supplies last. Use offer code NPOTY2024.