Crinum natans

Scientific name: Crinum natans

Family: Amaryllidaceae

Maximum size reached under cultivation: 50 - 100 cm (19.69 - 39.37 inch)

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Recommended pH range: 5.5 - 7

Recommended water hardness: 0 - 12°dGH (0 - 214.29ppm)

0°C 32°F30°C 86°F

Recommended temperature range: 15 - 25 °C (59 - 77°F)

Preferred propagation method: Bulb shoots

Native to: Africa

Growth rate: Slow

Recommended substrate: Fine gravel

Lighting requirements: Bright

Ideal placement in tank: Background

Common Name

Floating Crinum, African Onion Plant

Origin

Crinum natans is native to tropical regions of Africa, where it thrives in slow-moving rivers, lakes, and wetlands. It is well adapted to fully submerged conditions and is commonly found in shallow freshwater habitats.

Lighting Requirements

This plant prefers bright lighting. While it can tolerate medium light, insufficient lighting slows down growth and leads to paler, less vibrant leaves. For optimal results, provide strong, consistent illumination.

Planting Area

Best suited for the background of large aquariums due to its tall, flowing leaves. It can also be placed centrally as a focal plant in deeper tanks. Avoid burying the bulb completely; leave the top of the bulb exposed to prevent rot.

Propagation

Crinum natans reproduces through bulb offshoots. Mature plants will eventually develop small daughter bulbs, which can be gently separated and replanted. Take care when handling the bulbs and roots, as they are sensitive to disturbance.

Difficulty

Medium. While hardy and undemanding in terms of water chemistry, Crinum natans grows slowly and requires time to settle in. Once established, it is quite resilient and can coexist with herbivorous fish that typically ignore its tough leaves.

Short Description

Crinum natans is a striking aquatic plant known for its long, ribbon-like leaves that wave gently in the current. Though fully aquatic in aquarium settings, its bulb can tolerate brief periods of low water levels in the wild, where it grows in shallow, marshy areas. Its bold appearance makes it a favorite among aquascapers and hobbyists seeking a dramatic background plant. Though its growth rate is slow, it rewards patience with a unique visual texture and occasional flower stalks that may reach the water surface. Ideal for spacious tanks with stable water parameters and clean, nutrient-rich substrate.