Image: AI generated
Witchweed Plant Care
Striga aspera (Willd.) Benth.
Updated · Sources · How we source care data
Striga aspera, commonly known as rough witchweed, is a striking plant with vibrant purple flowers that stand out against its dark green foliage. Its unique growth habit forms dense clusters of stems that can reach up to 2 feet in height, making it a standout addition to any garden or landscape.
Every 3–5 days
Partial to full sun
65–80°F
40–60%
At a glance
How do you care for Witchweed?
Water Witchweed every 3–5 days, letting the top layer of soil dry out between waterings, and give it partial to full sun. It prefers temperatures of 65–80°F (18–27°C) and 40–60% humidity. Fertilize it every 4 months during the growing season.
What Is the Witchweed?
Witchweed (Striga aspera) belongs to the Orobanchaceae family within the Striga genus. Witchweed is native to Africa, Middle East.
Witchweed displays a parasitic annual herb growth habit, reaching up to 2 ft tall with a spread of approximately 1 ft. Witchweed produces tubular flowers in various colors.
Leaf size: approximately 4 inches.
How Often Should You Water a Witchweed?
Striga aspera 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 Witchweed Need?
Witchweed thrives in partial to full sun.
Light Requirement
Partial to full sun
What Temperature and Humidity Does the Witchweed Prefer?
Striga aspera grows best at temperatures of 65–80°F. Witchweed prefers humidity levels of 40–60%.
Temperature
65–80°F
Humidity
40–60%
What Soil Mix Works Best for a Witchweed?
Well-draining sandy soil with low fertility. Good drainage is essential for Witchweed to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Witchweed?
Feed Witchweed every 4 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 4 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 Witchweed?
Not applicable, as a parasitic plant. 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 Witchweed?
Witchweed can be propagated through seeds, rhizomes. Similar propagation techniques also apply to witchweed plant care, which shares the same genus.
Is the Witchweed Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Witchweed, 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 Witchweed?
Witchweed is susceptible to no common pests known. 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 Witchweed Need?
Witchweed grows outdoors in USDA Zone 13b. It survives winters down to planting zone 13b. Witchweed is native to Africa, Middle East. In cooler regions, grow Witchweed as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13b
Keep exploring plants
Witchweed 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 Striga genus — compare its care with other Striga species on PlantoScan.
Striga is part of the Orobanchaceae plant family — browse all Orobanchaceae genera and species.
Witchweed thrives in bright light and direct sun — see other bright-light plants.
More Striga Species
Other Striga species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Striga aspera (Willd.) Benth., family Orobanchaceae (first published in Compan. Bot. Mag. 1: 362 (1836)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Witchweed, 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: AI-generated illustration (labelled on the image).
- Hardiness zone: USDA Zone 13b, 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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