Leucojum aestivum is a bulbous perennial in the Amaryllidaceae that bears white, nodding flowers in March to April. Plants reach about 0.5 m at maturity. It is native from Europe to north Iran and suits moisture-retentive positions. The bulbs are ornamental and must not be eaten, so wear gloves when handling.

Summer Snowflake (Leucojum aestivum) bears white flowers in March to April and suits moist, sunny sites in fully hardy UK gardens.

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

Leucojum is a small genus of bulbous plants native to Eurasia belonging to the amaryllis family, subfamily Amaryllidoideae. As currently circumscribed, the genus includes only two known species, most former species having been moved into the genus Acis.

Leucojum aestivum

Summer snowflake | Leucojum aestivum

Leucojum aestivum 'Gravetye Giant' is a bulbous perennial that reaches about 0.5 m and flowers in March to April. It carries a mild, sweet fragrance and is hardy in UK gardens. Plant it where soil stays moist to wet but drains reasonably well, in full sun. The bulbs are ornamental and must not be eaten; wear gloves when handling and consult the HTA guide to potentially harmful plants for more detail.

Summer snowflake 'Gravetye Giant' (Leucojum aestivum 'Gravetye Giant') is a bulbous perennial that flowers in March–April and suits moist borders and.

Leucojum aestivum 'Gravetye Giant'

Summer snowflake 'Gravetye Giant' | Leucojum aestivum 'Gravetye Giant'

Leucojum aestivum var. pulchellum is a bulbous perennial in the Amaryllidaceae that flowers in the UK from March to April. It grows to about 0.5 m and carries a mild scent. Plant in full sun into sandy, loamy or clay soils that remain moist to wet but are not stagnant. All parts are toxic if ingested, so keep clear of areas used by children or pets.

Snowflake (Leucojum aestivum var. pulchellum) blooms in March–April and prefers full sun on moist, well-drained sandy, loamy or clay soils, hardy to H7.

Leucojum aestivum var. pulchellum

Snowflake | Leucojum aestivum var. pulchellum

Leucojum autumnale is a bulbous perennial in the Amaryllidaceae that produces scented spring flowers in March to April. It comes from western Mediterranean regions including Portugal, Spain, Morocco, Sicily and Tunisia. Plant it in well‑drained sandy or loamy soil, in a south‑facing, sheltered spot, and keep soil moisture moderate. Take care around children and pets because the plant is toxic if ingested.

Autumn Snowflake (Leucojum autumnale) is a bulbous perennial with a mild sweet fragrance that flowers in March–April and suits south‑facing, sheltered.

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

Leucojum autumnale

Autumn Snowflake | Leucojum autumnale

Leucojum vernum is a bulbous perennial in the Amaryllidaceae that produces nodding white, bell-like flowers with a mild, sweet fragrance. It flowers from March to April and typically reaches about 0.2 m in height. Plants perform best in full shade in moist but well-drained sandy, loamy or clay soils. The bulbs are ornamental only and should not be eaten, so handle with gloves and other protective equipment.

Spring Snowflake (Leucojum vernum) flowers from March to April and suits moist, shady spots in UK gardens.