Cucamonga manroot
Marah macrocarpa
Last reviewed: September 2026
Cucamonga manroot (Marah macrocarpa) is a perennial vine native to CA. It blooms in February, March, and April. The flowers draw bees.
Toxicity unknown
Cucamonga manroot (Marah macrocarpa) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
low
Size
180"–240" H × 120"–180" W
Bloom
Feb, Mar, Apr
Native to
CA
Pollinators
bees
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 458 programs across 44 states, each with a link to the provider and the date we last checked it.
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Browse plants for this ecoregion
Fast-growing perennial vine that climbs over shrubs and fences using coiling tendrils, with star-shaped white flowers followed by large, spiny green fruits. Dies back each year to a massive underground tuberous root.
Growing Cucamonga manroot
Grow Cucamonga manroot in full sun and low water. Mature plants reach 180 to 240 inches tall and spread 120 to 180 inches wide.
Wildlife value
Early spring flowers provide nectar for native bees; the vine's cover benefits small wildlife even as the top growth dies back in summer.
Common questions
- How much sun does Cucamonga manroot need?
- Cucamonga manroot grows best in full sun conditions.
- When does Cucamonga manroot bloom?
- Cucamonga manroot blooms in February, March, and April.
- Where is Cucamonga manroot native?
- Cucamonga manroot (Marah macrocarpa) is native to CA, per vouchered herbarium specimen records and regional native plant society lists.
- What pollinators does Cucamonga manroot attract?
- Cucamonga manroot draws bees.
Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow Cucamonga manroot? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.