Plant guide

Cogon grass.

Imperata cylindrica

Pronounced im-per-AH-tuh si-LIN-dri-kuh

Also known as Alang-alang, Blady grass, Cogon grass, Japgrass, Satintail, Speargrass, American Grass, Beady Grass, Bedding Grass, Bladey Grass, Blady grass, Cogongrass, Cotton Wool Grass

Cogon grass is a highly aggressive perennial grass known for its striking, sharp, and upright blades. It spreads rapidly through an extensive underground root system, making it quite difficult to manage in garden settings. Please be aware that this plant is considered a serious invasive species in many parts of the world.

At a glance

Care level: Easy
Plant type: Perennial grass
Light: Full sun
Indoor light: Direct sun
Water: Every 7 to 14 days
Mature size: 4 feet
Growth rate: Fast

Care

This grass thrives in full sun and tolerates a wide range of soil conditions. Watch for rapid spread into unwanted areas, as its rhizomes can easily choke out other plants. It is best to avoid planting this species due to its invasive nature.

Watering: It is quite drought tolerant once established.
Feeding: It rarely needs extra food as it is very vigorous.
Pruning: Cut back dead foliage in late winter to encourage fresh growth.
Repotting: It grows very quickly and will need a larger container often.
Soil: Well draining sandy or clay soil
Soil pH: 4.5 to 7.5

Safety

Pets: This plant is generally considered non toxic to cats and dogs.

How to identify it

Sharp, serrated leaf edges
Bright green, pointed blades
Dense, fluffy white flower plumes
Extensive underground rhizome network
Off center leaf midrib

Science

Family: Poaceae
Genus: Imperata
Order: Poales
Class: Liliopsida

Taxonomy resolved against GBIF.

Is your cogon grass looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.