Papyrus

Sun

Full sun to partial shade; give it the brightest position available in cool climates.

Water

Keep the root zone permanently wet. Grow in saturated soil or shallow water, with the crown at the surface or just submerged.

Soil

Rich, heavy loam or aquatic planting soil that retains water; ordinary free-draining borders are unsuitable unless kept consistently saturated.

Height

6-12 ft (1.8-3.7 m), occasionally taller in frost-free climates

Spread

3-6 ft (0.9-1.8 m), expanding farther through rhizomes where unrestricted

Flowers

Summer to autumn; tiny greenish-brown flowers appear within the radiating heads, which turn brown as seed develops.

Foliage

Evergreen. Tall, triangular green stems carry dense heads of fine, threadlike rays; true leaves are reduced mainly to sheaths at the stem bases.

Growth

Fast in warm weather with plentiful water and nutrients.

Care needed

Medium

• Heat tolerant
• Wildlife

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Needs looking after

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.1 ft (0.35 m)

2. After 1 year

   6 ft (1.8 m)

3. After 2 years

   9 ft (2.8 m)

   full size

About 2 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Mildly toxic: may upset a stomach

Invasive in

Australia

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Fast

• Use a large, heavy container to support the tall stems and contain the spreading rhizomes.
• Keep the soil saturated throughout active growth; check containers daily in hot weather.
• Feed container plants lightly during spring and summer; use aquatic fertiliser in ponds and avoid enriching the pond water.
• Shelter stems from strong winds, which can bend or break them.
• Before frost, move plants to a bright, frost-free place, preferably above 5°C, and keep the root ball wet.
• Divide crowded clumps in spring as new growth begins.

Pruning. Cut brown, broken or exhausted stems cleanly at the base whenever needed. In spring, remove any winter-damaged stems without cutting into emerging shoots.

Early spring

Remove dead stems and divide or repot crowded plants as growth resumes.

Late spring

Move overwintered plants outdoors after frost risk has passed and nights are reliably mild; acclimatise them gradually to direct sun.

Summer

Check water levels frequently and feed container plants lightly while they are growing strongly.

Late summer

Remove broken stems and check whether rhizomes are escaping their container.

Autumn

Bring plants under cover before frost in cold climates and stop feeding as growth slows.

Winter

Keep overwintering plants in bright light with wet roots; inspect regularly for spider mites and aphids.

• Plant in a contained pond margin to create a tall, airy backdrop to lower aquatic plants.
• Use a single large specimen in a watertight courtyard container as a vertical focal point.
• Pair with cannas and taro in a wet tropical-style planting for contrasting leaf shapes.
• Repeat substantial containers beside a terrace or pool for a strong architectural rhythm.

Garden styles it suits: Architectural minimal, Modern tropical, Tropical, Bog garden, Modern courtyard and Green on green.

Plant it with: Canna, Taro, Pickerelweed and Japanese iris.

Wildlife: Dense clumps provide shelter and perching places for pond-edge insects. The flowers are mainly wind-pollinated and are not a significant nectar source.

• Brown tips and collapsing stems from drying out: restore a consistently wet root zone and remove badly damaged stems.
• Frost damage: cut away dead stems once growth resumes; prevent recurrence by overwintering plants under cover.
• Spider mites indoors, causing pale or stippled growth: rinse stems and heads thoroughly and use insecticidal soap if needed, following the label.
• Aphids on young growth: wash them off with water or treat persistent colonies with insecticidal soap.

Not known to be toxic to people, cats, dogs or horses. No part is recognised as a serious poisoning hazard, but it is not a culinary plant and chewing coarse stems may cause irritation or stomach upset.

Where it spreads. Rhizomes can spread aggressively in frost-free wetlands. It is reported as an environmental weed in parts of Queensland and New South Wales, Australia. Keep it contained and never discard plants or rhizomes into waterways.

• Umbrella sedge (Cyperus involucratus)

  Its stem tops have a conspicuous umbrella of broad, flat, leaflike bracts rather than the dense cloud of fine rays typical of papyrus.

• Dwarf papyrus (Cyperus haspan)

  Usually much shorter, with smaller, more open heads and fewer rays; it lacks the towering stems and large, dense heads of mature papyrus.

Papyrus comes from the Greek papyros, the name for the plant used to make ancient writing material, while Cyperus derives from an ancient Greek name for sedges.

Propagation. Divide the rhizomes in spring, keeping several healthy shoots and roots on each section. Seed can also be sown on the surface of consistently wet compost in warm conditions; unlike umbrella sedge, true papyrus is not reliably propagated by placing detached heads upside down in water.

Accepted botanical name

Cyperus papyrus

In the US and Canada

Introduced in Hawaii, the lower 48 states and Puerto Rico.

Native range

Angola, Benin, Botswana, Burundi, Cape Provinces, Caprivi Strip, Central African Repu, Chad, Congo, Egypt, Ethiopia and Gabon.

Measured

Soil pH 7 to 7.5.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.