Cyperus alternifolius is a perennial sedge in the family Cyperaceae that prefers consistently wet or moist soil. Native to Africa and the Arabian Peninsula, it is often used at pond edges, in water gardens and as an indoor plant. It grows in full sun to partial shade and flowers from June to September.

Umbrella plant (Cyperus alternifolius) suits pond edges and indoor containers, preferring wet to moist soil and flowering June to September.

https://en.wikipedia.org/wiki/Cyperus_alternifolius

Cyperus is a large genus of about 700 species of sedges, distributed throughout all continents in both tropical and temperate regions.

Cyperus alternifolius

Umbrella Plant (Cyperus alternifolius) | Pond Edge Plant

Cyperus difformis, commonly known as dirty Dora, is a bushy, evergreen cultivar within the Cyperus genus, which comprises annual or evergreen, rhizomatous perennials with narrow, grass-like foliage. This cultivar thrives in conservatories or greenhouses and is suited to boggy conditions. It prefers well-drained loam soil with a pH ranging from acid to alkaline and grows best in full sun or partial shade, ideally in sheltered, south-, west-, or east-facing aspects. Cyperus difformis is hardy to UK zone H1c and is often used as a patio or container plant, with interest spanning spring to autumn.

Dirty Dora (Cyperus difformis) is an evergreen, grass-like plant ideal for conservatories and containers, thriving in sun or partial shade from spring to

Cyperus difformis

Cyperus longus is a perennial sedge reaching about 1.2 m, noted for a sweet, aromatic scent. It produces upright stems suited to damp ground and margins of shallow water. Flowering occurs from June to September. Plant in full sun in sandy, loamy or clay soils that remain moist to wet.

Sweet galingale (Cyperus longus) is a perennial sedge for pond margins and wet gardens that flowers June to September and prefers full sun.

https://en.wikipedia.org/wiki/Cyperus_longus

Cyperus longus

Sweet Galingale (Cyperus longus) | Pond Margins

Cyperus niveus var. leucocephalus is a bushy, evergreen cultivar of the Cyperus genus, known for its narrow, grass-like foliage and terminal clusters of small, greenish flower spikes. This plant thrives in conservatories or greenhouses and is suited to poorly-drained soils including chalk, clay, loam, and sand with varying pH levels. It prefers full sun or partial shade in sheltered, south-, west-, or east-facing aspects. Hardy to UK zone H1C, it is ideal for patio and container planting and can be propagated by seed in spring at temperatures of 18 to 21°C in moist compost.

Cyperus niveus var. leucocephalus is an evergreen, grass-like plant with greenish flower spikes, ideal for patios and containers in conservatories.

Cyperus niveus var. leucocephalus

Cyperus rotundus is a species of sedge (Cyperaceae) native to Africa, southern and central Europe, and southern Asia. The word cyperus derives from the Greek κύπερος, kyperos, and rotundus is from Latin, meaning "round".

Nutgrass (Cyperus rotundus) is a hardy sedge ideal for patios and containers, thriving in full sun or partial shade with winter interest.