Floating Sweet-grass (Glyceria fluitans) is a perennial aquatic grass native to Europe and parts of Asia, thriving in wetland habitats such as marshes, ditches, and slow-moving streams. It plays a crucial role in agroecology and regenerative agriculture by enhancing water management and habitat restoration. This grass is particularly valuable for its ability to stabilize soil in waterlogged conditions, improve biodiversity, and enhance water quality. It serves as an excellent plant for constructed wetlands, filtering pollutants and supporting aquatic life. In a food forest, it functions as a ground cover in the aquatic layer, providing habitat for beneficial insects and amphibians. Historically, its grains have been used in traditional diets in Europe, particularly in making porridge.
Growing Details
Glyceria fluitans thrives in full sun to partial shade and requires consistently moist, waterlogged soils. Prepare the soil by ensuring it is rich in organic matter and has good water retention properties. Mulching with straw or other organic materials can help maintain moisture levels. Companion plants include other wetland species like cattails and sedges. Avoid planting in areas prone to drying out. Harvest grains in late summer when they are mature, and dry them thoroughly before storage.
The map shows known occurrence points of <strong>Glyceria fluitans</strong> recorded in scientific biodiversity databases.
Source: <a href="https://www.gbif.org" target="_blank">GBIF.org</a> โ Global Biodiversity Information Facility
Location & Timing
native geo location: Native to Europe and parts of Asia
applicable geo region: Temperate regions
language used: en
Flowering:
middle
of May for 60 days
Harvest:
middle
of July for 30 days
Seed Start:
?
Indoor Start:
Transplant:
Uses & Benefits
Edible Rating:
(3/5)
edible uses: The grains of Floating Sweet-grass are edible and can be harvested for use as a cereal. Traditionally, they have been used to make porridge or added to soups. The grains are best harvested in late summer when they are fully mature. They should be dried thoroughly before storage to prevent mold.
Medicinal Rating:
(1/5)
medicinal uses: Glyceria fluitans has limited documented medicinal uses. It has been used in traditional medicine for its mild diuretic properties. However, caution is advised as it is not widely recognized in modern herbal medicine.
health concerns: Ensure grains are fully dried before consumption to avoid mold-related health issues.
other uses: Floating Sweet-grass is effective in natural water filtration systems and serves as a habitat plant in aquatic environments. It can also help prevent erosion in wetland areas.
Scientific Literature
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Botanical data
specie: Glyceria fluitans
common names: Floating Sweet-grass; Manna Grass; Water Ma
family: Poaceae
sub family: Pooideae
tribe: Meliceae
sub tribe:
genus: Glyceria
Growing Conditions
area needed: 0.0 m
spacing: 0.5 m
growing difficulty: Low
Deciduous / Evergreen: Evergreen
Seed Temp (Opt/Min/Max): 15ยฐC / 10ยฐC / 20ยฐC
Plant Temp (Opt/Min/Max): 18ยฐC / 0ยฐC / 25ยฐC
water demands: High
humidity:
light demands: Medium
root type: Shallow
frost tender: Low
hardness:โโโโโโโโโโ(5/10)
first harvest: 0 years
life span: 0 years
succession: Pioneer
growth rate: Medium
max height: 1.0 m
max width: 0.5 m
soil preference:
Heavy
pH preference:
Neutral
flower type:
Hermaphrodite
growth details: Glyceria fluitans thrives in full sun to partial shade and requires consistently moist, waterlogged soils. Prepare the soil by ensuring it is rich in organic matter and has good water retention properties. Mulching with straw or other organic materials can help maintain moisture levels. Companion plants include other wetland species like cattails and sedges. Avoid planting in areas prone to drying out. Harvest grains in late summer when they are mature, and dry them thoroughly before storage.
Potential Disturbances: Generally pest-free, but may occasionally be affected by aphids or fungal diseases in overly humid conditions. Introduce beneficial insects like ladybugs to control aphids. Use neem oil or garlic spray as organic treatments for fungal issues. Planting marigolds nearby can help repel pests.
Growth Timeline
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