Crinum longifolium is a species of Crinum in the Amaryllidaceae family native to Southeast Asia. In the UK it flowers from July to September. The summer flowering period makes it most useful where blooms can be seen at close range. Positioning affects how readily the July–September display will be appreciated.

Crinum longifolium is an Amaryllidaceae species from Southeast Asia that flowers from July to September.

Crinum is a genus of about 180 species of perennial plants that have large showy flowers on leafless stems, and develop from bulbs. They are found in seasonally moist areas, including marshes, swamps, depressions and along the sides of streams and lakes in tropical and subtropical areas worldwide.

Crinum longifolium

Crinum moorei is a bulbous perennial in the Amaryllidaceae that produces fragrant summer flowers from July to September. Native to South Africa, it prefers a sheltered position in full sun or partial shade. It grows best in fertile, well-drained soil that stays moist rather than waterlogged. The bulbs are ornamental and should not be eaten, so wear gloves when handling.

Lily of the Orinoco (Crinum moorei) is a fragrant bulbous perennial flowering July to September, best in full sun or partial shade in fertile.

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

Crinum moorei

Lily of the Orinoco | Crinum moorei

Crinum moorei 'Album' or 'Schmidtii' is a bulbous perennial in the Amaryllidaceae that produces strongly fragrant summer blooms. It originates from South Africa and performs best in a sunny or partly shaded position. Plant it in fertile, well-drained soil that remains reasonably moist and within a neutral to slightly acidic or slightly alkaline pH. Flowers appear from July to September.

Crinum moorei 'Album' or 'Schmidtii' is a South African bulbous perennial with fragrant flowers that bloom July to September and suits borders, containers.

Crinum moorei 'Album' or 'Schmidtii'

Crinum moorei 'H. N. B. Bradley' is a bulbous perennial in the Amaryllidaceae that produces fragrant flowers in July to September. Native to South Africa, it favours full sun or partial shade and a fertile, well‑drained but moist soil with a neutral to slightly acidic pH. It carries an H4 hardiness rating for the UK, suitable for average garden conditions. Plant it in borders, containers or at pond margins so the scent can be enjoyed.

Crinum moorei 'H. N. B. Bradley' bears fragrant summer flowers from July to September and prefers full sun or partial shade in fertile, moist soil.

Crinum moorei 'H. N. B. Bradley'

Crinum powellii 'Album' is a bulbous perennial in the Amaryllidaceae that bears large flowers on leafless scapes. The plant produces a rosette of basal leaves from a tunicate bulb and sends up solid stems that carry umbels of flowers. It flowers in the UK from July to September. The tall, leafless flowering stems place the blooms well above the foliage for clear summer impact.

Crinum powellii 'Album' is a bulbous Amaryllidaceae that produces flowers on leafless scapes from July to September.

Crinum powellii 'Album'

Crinum × powellii is a perennial bulbous plant in the Amaryllidaceae that produces strongly scented summer flowers. It flowers from July to September and grows from bulbs in moist, well-drained soil. Suitable in full sun or partial shade, it is hardy to H5. Bulbs are ornamental only and should not be eaten; wear gloves when handling.

Swamp Lily (Crinum × powellii) produces scented flowers from July to September and prefers moist, well-drained soil in full sun to partial shade.

Crinum × powellii

Swamp lily | Crinum × powellii

Crinum × powellii 'Ellen Bosanquet' is a bulbous perennial in the Amaryllidaceae prized for its fragrant summer blooms. It flowers from July to September. Plants prefer full sun or partial shade in fertile, well-drained soil that remains moist and a sheltered position. Use in borders, large containers or at water margins where fragrance can be appreciated.

Ellen Bosanquet Crinum (Crinum × powellii 'Ellen Bosanquet') produces fragrant flowers from July to September and suits sheltered, moist, well-drained.

Crinum × powellii 'Ellen Bosanquet'

Ellen Bosanquet Crinum | Crinum × powellii 'Ellen Bosanquet'

Crinum × powellii 'Haarlemense' is a bulbous perennial in the Amaryllidaceae grown for its fragrant summer flowers. It performs in full sun to partial shade on fertile, neutral to slightly acidic soil that stays moist but drains freely. The plant is hardy (H5) and suits both sheltered and more exposed positions. All parts are toxic if ingested, so site it away from children and pets.

Haarlem Crinum (Crinum × powellii 'Haarlemense') is a bulbous perennial with fragrant flowers from July to September, preferring full sun or partial shade.

Crinum × powellii 'Haarlemense'

Haarlem Crinum | Crinum × powellii 'Haarlemense'

Crinum × powellii 'Krelagei' is a bulbous perennial in the Amaryllidaceae noted for its fragrant summer flowers. It flowers from July to September and arises from a true bulb. Give it full sun or partial shade in fertile, well-drained but moist soil, and a sheltered aspect. It is rated H4 in the UK and is suitable for borders, containers and water gardens.

Crinum × powellii 'Krelagei' is a bulbous perennial with fragrant blooms that flower July to September, suited to borders, containers and water gardens.