Cyperus Alternifius - Umbrella Grass

Cyperus alternifolius, commonly known as the Umbrella grass or Umbrella Sedge, is an unusual moisture-loving plant with tall stems topped by graceful, radiating leaves. We love it for adding height, movement and a fresh waterside feel to a bright room, conservatory or pond display.

Origin

Cyperus alternifolius originates from tropical parts of Africa and Madagascar, where it grows naturally beside rivers, ponds and in marshy ground. Unlike most houseplants, it thrives with its roots in consistently wet soil.

Care Guide

• Light: Position in bright, indirect light or gentle sunshine. Too little light may cause weak, leaning stems.

• Watering: Keep the compost constantly moist. This is one of the few houseplants that should never be allowed to dry out.

• Water tray: The pot can stand in a shallow saucer of water during active growth. Check and refill it regularly, particularly during warm weather.

• Water quality: Rainwater or filtered water is ideal, especially in hard-water areas.

• Humidity: Average to high humidity is beneficial. Brown leaf tips may develop if the air or compost becomes too dry.

• Temperature: Keep at a warm room temperature. Protect the plant from cold draughts, frost and temperatures below 10°C.

• Summer position: It can spend summer outdoors beside a pond or in a water garden, but bring it inside before temperatures fall in autumn.

• Compost: Use moisture-retentive, peat-free houseplant compost. Unlike most indoor plants, this species does not need a particularly gritty mixture.

• Pot: Choose a watertight decorative container or place its nursery pot inside a deep saucer. Make sure the plant cannot become top-heavy and fall over.

• Feeding: Apply a balanced liquid houseplant fertiliser at half strength every four weeks during spring and summer. Reduce feeding during winter.

• Pruning: Cut yellow, brown or damaged stems back to the base with clean scissors. Trimming individual brown tips can leave the leaf shape looking uneven.

• Repotting: Repot in spring when the roots become crowded. Choose a container one size larger and use fresh, moisture-retentive compost.

• Propagation: Divide a mature plant during repotting. Sections with healthy roots and several stems can be planted into separate pots.

• Common problems: Brown tips usually indicate dry compost, low humidity or mineral-heavy water. Yellowing stems may be caused by cold conditions or exhausted growth. Watch for spider mites, aphids and mealybugs.

Pet Safety

• Generally considered pet-safe: Cyperus alternifolius is not commonly regarded as toxic to cats or dogs.

• Cats may be particularly attracted to its grass-like leaves and could damage the plant by chewing them.

• Eating a large amount of any plant material may still cause mild vomiting or digestive discomfort.

• Tall stems and pots standing in water can be easily knocked over, so choose a stable position away from playful pets.

• Fertilisers and pest-control products may not be pet-safe; always follow their instructions carefully.

• If your pet eats a substantial amount or develops unusual symptoms, contact your veterinary practice for advice.

Our Tip

Never treat this plant like an ordinary houseplant: its roots enjoy being wet. Keep its water tray topped up, provide plenty of light and remove ageing stems at the base to encourage a fresh, upright display.

D14 H60