Red Star Plant Care
Tritoniopsis antholyza (Poir.) Goldblatt
Updated · Sources · How we source care data
Tritoniopsis antholyza is a species of plant in the iris family. Its common name is the Karkarbloom or Karkar Reedpipe.
Every 7–10 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Red Star?
Water Red Star every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.
What Is the Red Star?
Red Star (Tritoniopsis antholyza) belongs to the Iridaceae family within the Tritoniopsis genus.
Red Star displays a clumping perennial herb growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Red Star produces showy spikes of tubular flowers in various colors.
Leaf size: approximately 8 inches.
How Often Should You Water a Red Star?
Tritoniopsis antholyza 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 Red Star Need?
Red Star thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Red Star Prefer?
Tritoniopsis antholyza grows best at temperatures of 50–80°F. Red Star prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Red Star?
Well-draining sandy soil with added organic matter like compost. Good drainage is essential for Red Star to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Red Star?
Feed Red Star every 6 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 6 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 Red Star?
Repot every 2-3 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 Red Star?
Red Star can be propagated through division of offsets, seeds. Similar propagation techniques also apply to two-coloured star plant care, which shares the same genus.
Is the Red Star Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
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 Red Star?
Red Star is susceptible to aphids, thrips, spider mites. 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 Red Star Need?
Red Star grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Red Star as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Red Star 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 Tritoniopsis genus — compare its care with other Tritoniopsis species on PlantoScan.
Tritoniopsis is part of the Iridaceae plant family — browse all Iridaceae genera and species.
Red Star thrives in bright light and direct sun — see other bright-light plants.
More Tritoniopsis Species
Other Tritoniopsis species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Tritoniopsis antholyza (Poir.) Goldblatt, family Iridaceae (first published in S. African J. Bot. 57: 226 (1991)) — World Flora Online record, IPNI name record.
- Pet toxicity: Red Star is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- 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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