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Environmental conservation
At the Great Fen, researchers are running trials with Glyceria fluitans in order to assess its physical and financial viability as a crop in wet farming systems. Glyceria fluitans was chosen because it has been consumed by humans for a long time and because of its tolerance to a wide range of growing conditions. This tolerance originates from the fact that Glyceria fluitans is to some extent self-sterile and therefore outbreeding, which allows for adaptation.

Flood tolerance
When a shoot is submerged in floodwater there is a strong reduction of diffusion of gases which limits oxygen and carbon dioxide availability. To handle the poor gas exchange while submerged, floating sweet grass forms a gas film around the leaves. The gas film allows to increase the gas exchange since the diffusion of gas within the film is rapid. Floating sweet grass has two kind of leaves: floating leaves and aerial leaves. Floating leaves form a gas film only on the adaxial side, instead aerial leaves form it on both sides. The formation of a gas film is caused from the superhydrophobicity of the leaves, which is provoked from the special structure of the leaves. Ideed they have a plicate shape with ridges and grooves, furthermore on the microscale they have convex papillose epidermal cells forming papillae and some three-dimensional epicuticular waxes. A gas film vanishes typically after 2-6 days of submergence because the leaves become hydrophilic. About the beneficial trait of the gas film development it can be say that floating sweet grass through it enhances the gas exchange and therefore the photosynthesis under flood conditions, but it is saw as a short term strategie.

Farming techniques
The use and cultivation of Glyceria fluitans disappeared little by little during the 19th and 20th century due to its long gathering time and the disappearance of wetlands. For this reason, known farming techniques are old and not very applicable to today's production systems anymore.

Harvest and postharvest treatments
Glyceria fluitans is harvested in the second half of June or early July. The maturation and harvest time of floating mannagrass were interesting for farmers in the past centuries because it preceeded the wheat and rye harvest by 1 month, a period of significant cereal shortage. The grains of floating sweetgrass were harvested with a sieve in the morning dew. The sieves were described with long handles and only strong people could use them. After the harvest, the grains were dried out and grinded in a mortar filled with straw at the bottom so that the shells could be removed. The reason why Glyceria fluitans grains were harvested in the morning dew are the following: firstly, grains tend to stick better to the sieves when humid. Secondly, the grains of dry plants tend to fall more easily on the ground at the smallest movement.

However, these harvest techniques are not suitable for today’s agricultural production and new cultivars through breeding should be developed.

Sowing
The sowing of Glyceria fluitans takes place in summer. The seeding density is 8 to 12 lbs per acre.

As a food
Glyceria fluitans grains were popular in Poland, Germany, Hungary and other European countries for their sweet taste and nutrient richness. In Poland, foods containing Glyceria fluitans were pointed out as specialities of the local cuisine. Originally, Glyceria fluitans was used to prepare dishes as sweet cakes, flatbreads, dumplings, with butter or boiled milk, broths and soups, with oriental spices, as well as in sausages as binding additive.

Due to its healthy properties, between the 17th and 18th century, its consume was advised by pharmacopoeias to people with debilitating diseases as well as malnourished young people.

Nutrient content
100 g of Glyceria fluitans grains (endosperm, ca. 13.5% water content) contain about: 9.69% of protein, 0.43% of total fat, 75.06% of carbohydrate (starch and sugar), 0.21% of dietary fiber and 0.61% of ash.

Based on the taxonomy of Glyceria fluitans its grains can be considered gluten free.