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Toxic☠️ To avoid

🍇 Canada Moonseed

Menispermum canadense · Menispermaceae

🍁 North America
🧠 To remember it“A crescent seed, never a grape indeed” — cut open the fruit before trusting your eyes.
Canada Moonseed — Menispermum canadense

🔍 Identify it without mistakes

North American climbing vine whose clusters of small blue-black fruits look deceptively like wild grapes, a documented and potentially dangerous confusion for inexperienced foragers. The detail that gives the plant away every time is the seed: a grape contains several oval seeds, while moonseed has a single, flattened, crescent-moon-shaped seed—hence its name.

  1. simple, broad, shield-shaped leaves with 3-7 shallow lobes, resembling grape leaves but lacking the typical fork-like tendrils
  2. small, round, blue-black fruits with a waxy bloom in loose clusters, closely mimicking wild grapes
  3. CUT THE FRUIT OPEN: a single, flat crescent seed in moonseed, compared to several oval seeds in grapes
  4. climbing vine without tendrils (twines directly around support, unlike grapevines which use tendrils)
Sizevine up to 5-6 m
FloweringJune-July, fruits August-October
Habitatwooded riverbanks, riparian hedgerows, moist forest edges of North America

⚠️ Not to be confused with

Wild Grape (edible) (Vitis spp.)none for the wild grape itself, but this confusion is ranked among the most dangerous in North America for this exact reason

To tell them apart: ABSOLUTE RULE before picking any "wild grape": cut a fruit in half—several oval seeds confirm an edible grape, a single flat crescent moon seed marks toxic moonseed; grapevines also have forked tendrils that moonseed lacks

Riverbank Grape / Wild Grape (Vitis riparia)deadly (toxic moonseed, edible grape)

To tell them apart: forked tendrils present on the grapevine, ABSENT on moonseed (which climbs by twining without tendrils); multiple round seed(s) in grapes versus A SINGLE crescent moon seed in moonseed—a decisive criterion if a fruit is already picked; grapevine leaves have coarse teeth and distinct palmate veins versus moonseed leaves with often smoother edges and petioles attached slightly inside the margin (peltate)

☠️ What kills

nomDauricine and related isoquinoline alkaloids, concentrated in fruits and roots
dose letale estimeea small quantity of fruit can cause significant poisoning in children; the precise human lethal dose is not established, but the species is classified as toxic by North American poison control centers (approx)
delai1 to 3 h
symptomesdigestive disorders (nausea, vomiting, abdominal pain), in severe cases neurological disorders and seizures described by analogy with other isoquinoline alkaloids
antidoteno specific antidote; symptomatic treatment
morts documenteesnot clearly documented in humans to date, but the plant is classified as toxic out of caution by North American authorities; the main risk remains confusion with edible wild grapes (approx)

First steps : Call Poison Control or your local poison center in case of moonseed fruit ingestion. Do not induce vomiting. Before harvesting any "wild grape", systematically cut open a fruit to check the number of seeds.

Sources (2)

No entry replaces a certain identification in the field, or medical advice. When in doubt: don't eat it. If ingestion is suspected: poison control or 112/911.