K Webb (Cenchrus setosus)

Photo: no rights reservedCC0 1.0via iNaturalist

K Webb Plant Care

Cenchrus setosus Sw.

Updated · Sources · How we source care data

This plant is easily distinguished by its dense clusters of bristly hairs covering its spiky seed heads. Native to Africa and Asia, it thrives in hot, arid climates, making it a coveted addition to collections of drought-tolerant plants.

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Water

Every 7–14 days

Light

Full sun

Temp

65–85°F

Humidity

40–70%

At a glance

How do you care for K Webb?

Water K Webb every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 65–85°F (18–29°C) and 40–70% humidity. Fertilize it every 8 months during the growing season.

Where Is the K Webb Native To?

Native range107 countries

What Is the K Webb?

K Webb (Cenchrus setosus) belongs to the Poaceae family within the Cenchrus genus. K Webb is native to Africa, the Arabian Peninsula, and South and Southeast Asia, extending from India to Indo-China, and has been widely introduced to tropical and subtropical regions across the Americas, Pacific Islands, and parts of Asia. K Webb is also known as Birdwood grass, Dab, Dab grass.

K Webb displays an upright, clumping grass growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. K Webb produces small spikelets in terminal panicles.

Leaf size: approximately 12 inches.

How Often Should You Water a K Webb?

Cenchrus setosus 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 K Webb Need?

K Webb thrives in full sun.

Light Requirement

Full sun

What Temperature and Humidity Does the K Webb Prefer?

Cenchrus setosus grows best at temperatures of 65–85°F. K Webb prefers humidity levels of 40–70%.

Temperature

65–85°F

Humidity

40–70%

What Soil Mix Works Best for a K Webb?

Well-draining sandy soil with good aeration. Good drainage is essential for K Webb to prevent waterlogging, which leads to root rot and fungal issues.

How Often Should You Fertilize a K Webb?

Feed K Webb every 8 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 8 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 K Webb?

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 K Webb?

K Webb can be propagated through seeds. Similar propagation techniques also apply to pearl millet plant care, which shares the same genus.

Is the K Webb Toxic to Pets and Children?

Pet safety not verified

The ASPCA does not list K Webb, 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 K Webb?

K Webb is susceptible to aphids, grasshoppers. 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 K Webb Need?

K Webb grows outdoors in USDA Zone 9a – 11b. It survives winters down to planting zone 9a. K Webb is native to Africa, the Arabian Peninsula, and South and Southeast Asia, extending from India to Indo-China, and has been widely introduced to tropical and subtropical regions across the Americas, Pacific Islands, and parts of Asia. In cooler regions, grow K Webb as a houseplant or bring it indoors before the first frost.

Hardiness Zone

Zone 9a – 11b

Keep exploring plants

K Webb 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 Cenchrus genus — compare its care with other Cenchrus species on PlantoScan.

Cenchrus is part of the Poaceae plant family — browse all Poaceae genera and species.

K Webb thrives in bright light and direct sun — see other bright-light plants.

More Cenchrus Species

Other Cenchrus species in PlantoScan's care catalogue share similar watering, light, and soil preferences:

Sources

  • Scientific name & taxonomy: Cenchrus setosus Sw., family Poaceae (first published in Prodr. Veg. Ind. Occ. : 26 (1788)) — World Flora Online record, IPNI name record.
  • Pet toxicity: Pet safety not verified: the ASPCA does not list K Webb, 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: Public domain, CC0 1.0, iNaturalist — original.
  • Hardiness zone: USDA Zone 9a – 11b, 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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