Photo: Adam J. SearcyCC BY 4.0via iNaturalistresized / cropped
Large-fruited Manroot Plant Care
Marah macrocarpa (Greene) Greene
Updated · Sources · How we source care data
This plant's uniquely heart-shaped leaves are a standout feature, making it easily recognizable. Hailing from California, Marah macrocarpa's rare and striking appearance attracts plant collectors seeking an eye-catching addition to their collection.
Every 7–14 days
Full sun to partial shade
60–80°F
40–60%
At a glance
How do you care for Large-fruited Manroot?
Water Large-fruited Manroot every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 60–80°F (16–27°C) and 40–60% humidity. Fertilize it every 2 months during the growing season.
Where Is the Large-fruited Manroot Native To?
What Is the Large-fruited Manroot?
Large-fruited Manroot (Marah macrocarpa) belongs to the Cucurbitaceae family within the Marah genus. Large-fruited Manroot is native to Southern California and northern Baja California. Large-fruited Manroot is also known as California Manroot.
Large-fruited Manroot displays a vining, sprawling habit growth habit, reaching up to 15 ft tall with a spread of approximately 10 ft. Large-fruited Manroot produces small, greenish-white flowers.
Leaf size: approximately 8 inches.
How Often Should You Water a Large-fruited Manroot?
Marah macrocarpa requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Large-fruited Manroot Need?
Large-fruited Manroot thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Large-fruited Manroot Prefer?
Marah macrocarpa grows best at temperatures of 60–80°F. Large-fruited Manroot prefers humidity levels of 40–60%.
Temperature
60–80°F
Humidity
40–60%
What Soil Mix Works Best for a Large-fruited Manroot?
Rich, well-draining soil with plenty of organic matter. Good drainage is essential for Large-fruited Manroot to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Large-fruited Manroot?
Feed Large-fruited Manroot every 2 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 2 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Large-fruited Manroot?
Repot annually in spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Large-fruited Manroot?
Large-fruited Manroot can be propagated through seeds.
Is the Large-fruited Manroot Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Large-fruited Manroot, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Large-fruited Manroot?
Large-fruited Manroot is susceptible to aphids, spider mites, squash bugs. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Large-fruited Manroot Need?
Large-fruited Manroot grows outdoors in USDA Zone 8b – 11a. It survives winters down to planting zone 8b. Large-fruited Manroot is native to Southern California and northern Baja California.
Hardiness Zone
Zone 8b – 11a
Keep exploring plants
Large-fruited Manroot is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Marah genus — compare its care with other Marah species on PlantoScan.
Marah is part of the Cucurbitaceae plant family — browse all Cucurbitaceae genera and species.
Large-fruited Manroot thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Marah macrocarpa (Greene) Greene, family Cucurbitaceae (first published in Leafl. Bot. Observ. Crit. 2: 36 (1910)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Large-fruited Manroot, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Adam J. Searcy, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 8b – 11a, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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