TankBud

Cyperus helferi

Also known as Helfer's sedge, Helfer's flatsedge, Aquatic umbrella sedge

FreshwaterRosetteSide shootsRhizome division

Cyperus helferi (Cyperus helferi)
Aquarium Plants Factory · Used with permission

Care at a glance

Light
Medium light
CO2
CO₂ beneficial
Temperature
72–82°F
22–28°C
Max height
11.8 in
30 cm
Growth rate
Slow
Placement
Midground
Type
Rosette
pH
5.5–7.5
Hardness
2–18 dGH
Spread
7.9 in (20 cm)
Nutrient uptake
Root + water column
Growth region
Submersed or emersed
Difficulty
Medium
Family
Cyperaceae
Origin
Southeast Asia (Thailand)

Overview

Cyperus helferi is a sedge for the midground, or a softer background in larger tanks, where its arching, grassy leaves add movement. It is rated medium, a bit more demanding than the easiest plants.

Did you know

Cyperus helferi is a relative of papyrus, the Egyptian paper plant, in the same sedge family. That is why it takes on an umbrella-grass look when allowed to grow emersed.

Caring for Cyperus helferi

Plant Cyperus helferi carefully, with the crown just above the substrate, since its root system is surprisingly small for its size. Give it open space with some flow rather than a shaded corner. Be patient while it adapts from emersed nursery growth.

It wants medium light and benefits clearly from CO2. It needs a full range of nutrients, including nitrate, potassium, iron and trace elements, or the leaves yellow and thin. It feeds through both roots and leaves, so use root tabs as well as a liquid fertilizer. Keep the water at 72 to 82°F (22 to 28°C).

Growth is slow, so it stays put without much trimming. It is also slow to recover from a deficiency or melt. Cut off a side shoot once it has a few leaves, or divide the rhizome, to make new plants.

Good to know

Cyperus helferi is a sedge in the family Cyperaceae, not a true grass and not related to the sword plants. It was the first Cyperus species to be established in the aquarium hobby. Unlike most sedges, which are grown only as marsh or pond plants, it adapts to permanent submersion and keeps producing flexible underwater leaves.

In the wild

Cyperus helferi comes from Thailand and nearby parts of Southeast Asia. It grows in shallow streams and on seasonally flooded riverbanks. It spends part of the year emersed on damp ground and submerges when the water rises.

Common questions

Does Cyperus helferi need to be planted in the substrate?

Yes. Bury the roots and leave the crown, where the leaves join, just above the substrate.

Does Cyperus helferi need CO2?

No, but it helps. Cyperus helferi can grow without injected CO2, and added CO2 makes it grow faster.

How much light does Cyperus helferi need?

Cyperus helferi wants medium light. A light sold for planted tanks covers it.

Does Cyperus helferi need root tabs?

They help. Cyperus helferi takes nutrients through both its roots and its leaves. Root tabs near its roots and a liquid fertilizer cover both.

How do you propagate Cyperus helferi?

Cyperus helferi propagates by side shoots and rhizome division. Cut a side shoot off once it has a few leaves and plant it on its own. Cut the rhizome into pieces with several leaves each, then tie or plant each piece.

How tall does Cyperus helferi grow?

Cyperus helferi grows to about 11.8 in (30 cm) tall. It grows slowly and rarely needs trimming.

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