Photo: Rachael KaiserCC BY 4.0via iNaturalistresized / cropped
Giant Discocalyx Plant Care
Discocalyx megacarpa Merr.
Updated · Sources · How we source care data
Discocalyx megacarpa is a striking plant known for its large, glossy leaves that can reach up to 12 inches in length. Originating from tropical rainforests, this plant thrives in humid environments and is popular among enthusiasts for its impressive size and unique appearance.
Every 7–10 days
Bright indirect light
65–75°F
60–80%
At a glance
How do you care for Giant Discocalyx?
Water Giant Discocalyx every 7–10 days, letting the top layer of soil dry out between waterings, and give it bright indirect light. It prefers temperatures of 65–75°F (18–24°C) and 60–80% humidity. Fertilize it every month during the growing season.
Where Is the Giant Discocalyx Native To?
What Is the Giant Discocalyx?
Giant Discocalyx (Discocalyx megacarpa) belongs to the Primulaceae family within the Discocalyx genus. Giant Discocalyx is native to Guam and the islands of Rota and Saipan within the Commonwealth of the Northern Mariana Islands. Giant Discocalyx is also known as Large-fruited Discocalyx.
Giant Discocalyx displays a low rosette, spreading growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Giant Discocalyx produces small, star-shaped flowers in various colors.
Leaf size: approximately 8 inches.
How Often Should You Water a Giant Discocalyx?
Discocalyx megacarpa requires watering every 7–10 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 7–10 days
Let soil partially dry between waterings
What Light Does the Giant Discocalyx Need?
Giant Discocalyx thrives in bright indirect light. Avoid placing Giant Discocalyx in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect light
What Temperature and Humidity Does the Giant Discocalyx Prefer?
Discocalyx megacarpa grows best at temperatures of 65–75°F. Giant Discocalyx prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
65–75°F
Humidity
60–80%
What Soil Mix Works Best for a Giant Discocalyx?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Giant Discocalyx to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Giant Discocalyx?
Feed Giant Discocalyx every month 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 month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Giant Discocalyx?
Repot every 1-2 years in early 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 Giant Discocalyx?
Giant Discocalyx can be propagated through division, seeds. Similar propagation techniques also apply to discocalyx dissecta plant care, which shares the same genus.
Is the Giant Discocalyx Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Giant Discocalyx, 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 Giant Discocalyx?
Giant Discocalyx is susceptible to aphids, spider mites, mealybugs. 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 Giant Discocalyx Need?
Giant Discocalyx grows outdoors in USDA Zone 12b – 13a. It survives winters down to planting zone 12b. Giant Discocalyx is native to Guam and the islands of Rota and Saipan within the Commonwealth of the Northern Mariana Islands. In cooler regions, grow Giant Discocalyx as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12b – 13a
Keep exploring plants
Giant Discocalyx 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 Discocalyx genus — compare its care with other Discocalyx species on PlantoScan.
Discocalyx is part of the Primulaceae plant family — browse all Primulaceae genera and species.
Giant Discocalyx 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: Discocalyx megacarpa Merr., family Primulaceae (first published in Philipp. J. Sci., C 9: 126 (1914)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Giant Discocalyx, 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: Rachael Kaiser, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 12b – 13a, 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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