Euryale ferox Seeds | Fox Nut
LATIN NAME: Euryale ferox
COMMON NAME: Fox Nut
Plant Profile
Euryale contains a single species, which is unusual among the water lilies and their allies. Molecular work places it firmly among the Nymphaeaceae, close to the other large-flowered aquatics of the order, and the argument for a separate family has largely been about emphasis rather than ancestry. A plant with one living representative and a fossil record stretching back into the Cretaceous is a rare thing to be able to grow in a garden pond.
Fox nut flowers are violet-purple and solitary, held just above or at the surface, and many of them are cleistogamous: they pollinate themselves without ever opening fully. Others open and are visited by insects. The result is a plant that can set abundant seed in a pond with no pollinator traffic at all, which is one reason it has travelled so readily with human agriculture. The seed that follows is round and black, with a dense coat, and each fruit holds a large number of them.
The leaves cover ground quickly, so thin the stand while the pads are still small enough to handle, leaving enough room that the leaf margins do not overlap and shade one another. A stand that is too dense sets fewer fruit and holds more disease. Remove yellowing leaves and any floating weed before it mats over the crowns.
Collect the fruits as they ripen and split them to release the seed, then wash and dry the seed in the shade. Store it cool and damp rather than bone dry, because the seed coat dislikes desiccation; a jar of damp sand in a cool shed holds it better than an open paper packet. Seed kept this way can be carried over to the next season in a frost-free place.
Science & Biotechnology
Salisbury named the genus after Euryale, one of the Gorgons of Greek myth, and one look at the fruit explains the choice. It is a spongy, globose body studded with prickles and crowned by a persistent ring of sepals that looks like a horned head. Under the water the plant is a puzzle of contrasts, and the prickly mature fruit is the least of them.
Uses & Benefits
The seed is mostly starch held inside a dense black testa, and the processing step that made it famous is puffing. In Bihar and in the lower Yangtze region the dried seeds are roasted or heated under pressure until the kernel expands and the coat splits, turning a hard black pellet into a light, white, porous snack. Before that step the seed is tough and faintly astringent; after it, the texture is closer to a popped cereal than to a nut. The same starch is milled for flour and used in porridge, and the puffed seed is sold through northern India as a street and festival food.
Growing from Seed
The floating leaf is enormous, round and crinkled, with a quilted green upper surface and a waxy bloom that sheds water. Turn it over and the same leaf is a different organ: the underside is deep violet-red and covered in stout prickles, and the veins stand out like ribs. Submerged leaves are thinner, arrow-shaped and less heavily armed. The prickles are not decoration; they deter grazing fish and birds and protect the leaf base from being torn. Petioles and flower stalks rise from a rhizome anchored in the mud, and they are prickly too.
The crop is grown in shallow, still water, in ponds and flooded fields that are worked by hand from small boats. Bihar is the centre of production, with the lower Yangtze basin as the East Asian counterpart, and in both places the plant is treated as a season-long aquatic crop that also suppresses weeds and shelters fish fry. Water level matters more than soil: the plant wants warm, calm water and mud below it, and it dislikes cold currents.
Our Take
Grow fox nut if you have warm still water and the patience to handle a prickly crop by hand; gloves are not optional. In the same pond, sacred lotus gives the taller, edible-seeded counterpart and water plantain fills the shallow margin. For the moving-water edge, umbrella plant takes the wet ground the fox nut would sulk in, and water spinach makes a fast edible crop in the same warm shallows.
Related Reading
Gardeners who grow Fox Nut often pair it with these related subjects: