Cyperus ALTERNIFOLIUS

Cyperus ALTERNIFOLIUS - Umbrella papyrus, Umbrella palm, Umbrella sedge, Cyperus alternifolius.

Cyperus is a genus of moisture-loving plants in the family Cyperaceae, comprising more than 600 species distributed in the tropics and subtropics worldwide. The plants occur along the banks of rivers, lakes, and marshes, where they form dense thickets. Many species have long been used by humans as ornamental, medicinal, or utilitarian crops.

Representatives of the genus are perennial herbaceous plants with erect cane-like stems and characteristic whorls of leaves at their apices. The leaves are narrow, elongated, often forming an "umbrella", making the plants easily recognizable. The flowers in Cyperus are small, inconspicuous, wind-pollinated, gathered into spikelets. The ovary is superior, unilocular, with a single ovule. The fruits are very small triquetrous or slightly flattened nutlets.

Umbrella papyrus is one of the most popular species, reaching 1-1.5 m (3.3-4.9 ft) in height in cultivation. It is distinguished by long slender stems crowned by a whorl of linear leaves resembling umbrella ribs. The leaves are bright green, forming decorative tufts. The plant forms dense thickets with generous watering and is suitable both for pot culture and for water feature landscaping.

Flowering in cultivation is rare and inconspicuous: small spikelets with unremarkable greenish-brown flowers form. The fruits are small nutlets, ripening only under favorable conditions.

Propagation is carried out by seeds, division of the clump, and apical cuttings. For cuttings, leaf rosettes are taken, with the cut made below a node. Cuttings 10-15 cm (4-6 in) long are rooted in water or in moist sand. Each rosette yields several young plantlets, which are divided and potted up.

Seeds are sown on the surface of the soil in spring or early autumn, lightly pressed down, and kept at a temperature of 20-25 °C (68-77 °F). Sprouts appear in 4-6 weeks; the maximum possible germination period can exceed 8 weeks. Young seedlings are very fragile, so only mature specimens are transplanted.

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Cyperus is unpretentious regarding growing conditions; optimal temperature is 24-28 °C (75-82 °F). In winter, the plant can be kept at +12 °C (54 °F) with moderate watering. It grows best in southern, eastern, or western exposures, but during the summer period requires light shading from direct solar rays.

Watering is generous; placing the pot in a water saucer or basin filled to the brim is recommended. The soil must be constantly moist. Mature specimens are grown in clay pots with a nutrient substrate; young plants require regular misting.

For planting, a mixture of clay-sod soil, humus, leaf mold, and sand (3:1:1:1) is used; options with peat or palm soil with sand are acceptable. Optimal substrate acidity is pH 5-6.5. Repotting is performed every 3 years with removal of old roots and pruning of dead stems.

In summer, fertilizers are applied once a month at half strength. Young plants require phosphorus feedings for root system development. Mature specimens do well with balanced fertilizers.

The plant can be affected by spider mites, thrips, mealybugs, and is susceptible to root rot. In dry air, leaf tips turn brown; at a temperature of -2 °C (28 °F) the leaves perish, and at -8 °C (18 °F) the roots die.