Coastal Manroot

Marah oreganus

Native to:
Canada, United States

📍 View on iNaturalist →

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Cucurbitaceae
Genus:
Marah (Kellogg | - m)
Species:
Marah oreganus
USDA Symbol:
MAOR3

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb , Vine
Height:
600 cm
Light Requirements:
Full Sun
Drought Tolerance:
High
Bloom Months:
mar,apr,may,jun
Bloom Colors:
white, cream

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Caterpillars:
★☆☆☆☆ Recorded caterpillar host plant (HOSTS Database)

Host Plant for Caterpillars

Clepsis fucana, Glorious Squash Vine Borer (Melittia gloriosa), Spilosoma vestalis

Reported Fauna Sightings

Bees: Black-tailed bumble bee (Bombus melanopygus)

Garden & Ecology Notes

Wildlife Value:
bees, birds
Deer Resistant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Resprouts vigorously from large tuberous root after fire or top damage.

Soil Requirements

Soil Type:
rich, well-drained loamy soil
pH:
5.5 - 7.5 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
native to open woodlands and rocky slopes

Propagation & Germination

Stratification:
Cold/moist stratification required — 60–90 days
Scarification:
Seed coat scarification required before sowing
Germination Time:
14–60 days
Notes:
Seeds have hard coats requiring scarification. Cold stratification improves germination rates significantly.

The above propagation data sourced from Claude AI

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).; then Cold-moist stratification for 90 days.

Source: Claude AI