Red Spikerush Plant Care
Canscora alata (Roth) Wall.
Updated · Sources · How we source care data
Canscora alata is a striking plant known for its unique red and green striped leaves, giving it a vibrant appearance that stands out in any garden. Native to moist areas of India, this plant thrives in humid climates and is prized by enthusiasts for its eye-catching foliage.
Every 3–5 days
Partial shade to full sun
65°F
60–80%
At a glance
How do you care for Red Spikerush?
Water Red Spikerush every 3–5 days, letting the top layer of soil dry out between waterings, and give it partial shade to full sun. It prefers temperatures of 65°F (18°C) and above and 60–80% humidity. Fertilize it every 2 months during the growing season.
What Is the Red Spikerush?
Red Spikerush (Canscora alata) belongs to the Gentianaceae family within the Canscora genus. Red Spikerush is native to India. Red Spikerush is also known as Canscora decussata.
Red Spikerush displays a low rosette, spreading ground cover growth habit, reaching up to 1 ft tall with a spread of approximately 1 ft. Red Spikerush produces small, tubular purple flowers in clusters.
How Often Should You Water a Red Spikerush?
Canscora alata requires watering every 3–5 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 3–5 days
Let soil partially dry between waterings
What Light Does the Red Spikerush Need?
Red Spikerush thrives in partial shade to full sun.
Light Requirement
Partial shade to full sun
What Temperature and Humidity Does the Red Spikerush Prefer?
Canscora alata grows best at temperatures of 65°F. Red Spikerush prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
65°F
Humidity
60–80%
What Soil Mix Works Best for a Red Spikerush?
Well-draining loamy soil with added organic matter for moisture retention. Good drainage is essential for Red Spikerush to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Red Spikerush?
Feed Red Spikerush 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 Red Spikerush?
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 Red Spikerush?
Red Spikerush can be propagated through seeds, division of root ball.
Is the Red Spikerush Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Red Spikerush, 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 Red Spikerush?
Red Spikerush is susceptible to aphids, spider mites, whiteflies. 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 Spikerush Need?
Red Spikerush grows outdoors in USDA Zone 10a – 12b. It survives winters down to planting zone 10a. Red Spikerush is native to India. In cooler regions, grow Red Spikerush as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 10a – 12b
Keep exploring plants
Red Spikerush 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 Canscora genus — compare its care with other Canscora species on PlantoScan.
Canscora is part of the Gentianaceae plant family — browse all Gentianaceae genera and species.
Red Spikerush 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: Canscora alata (Roth) Wall., family Gentianaceae (first published in Numer. List : n.º 4363 (1831)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Red Spikerush, 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.
- Hardiness zone: USDA Zone 10a – 12b, 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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