Photo: Hörður Kristinsson from Eyjafjarðarsveit, Island, CC BY 2.0 (via Wikimedia Commons)

Water Pygmyweed

Crassula aquatica

Also known as Pigmyweed, Pygmyweed, Swamp Stonecrop, Water Stonecrop, Tillaea aquatica

At a glance

Family

Crassulaceae (stonecrop family)

Type

Tiny annual aquatic or mud-loving succulent

Parts used

Not established for medicinal or culinary use; the whole plant is of botanical and ecological interest only

Size

Under 2 inches (1 to 5 cm), often forming low mats

Bloom

Minuscule white to pale pink four-petaled flowers, summer into early fall

Habitat

Shallow pond edges, lake margins, mudflats, ditches, and slow streams across temperate North America, Europe, and Asia

Acquisition

Forage

This plant in HerbSense

Key benefits

✦

Colonizes bare mudflats fast

Tiny food source for waterfowl

Indicator of healthy wetlands

Curiosity for pond watchers

Traditional uses

✦

Water Pygmyweed does not carry a documented history in herbal medicine or folk remedy the way many of its succulent cousins do. It is a plant botanists and wetland naturalists know well, a modest little colonizer that appears on freshly exposed mud after a pond drops or a shoreline recedes, then vanishes again as quickly as it came. Its real story is ecological rather than medicinal, a small green stitch in the fabric of a healthy wetland edge, offering forage and cover to the tiny creatures that share its muddy world. Because no reliable tradition of ingestion or topical use has come down to us, this entry stays with what can be said honestly: it is a plant to observe, not to prepare.

How to grow & use it

✦

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Choose it when

“For the quiet places where pond meets mud, and the smallest green things go unnoticed until you kneel down to look.”

Did you know?

Crassula aquatica belongs to the same succulent family as jade plants and hens-and-chicks, a group famous for hoarding water against drought. Its little wetland relative does the opposite, spending much of its life fully submerged or rooted in soggy mud, an amphibious oddball in a family built for dry spells.

Safety

This small aquatic plant has no history of food or medicine use and no established safety data, so it isn't eaten or used as a remedy.