Throughout summer, upright stems are thrown up bearing delicate sprays of brown flowers. What does it look like? Flowers appear in spring in Aerenchyma (spongy tissue whose air spaces facilitate atmospheric gaseous exchange and increase Telephone: 608.223.3571 Fax: 608.884.4640 Email: [email protected] In 2006, it was listed as a priority environmental weed in at least one Natural Resource Management region. With a vigorous habit, British native Glyceria maxima is perfect for creating natural looking planting schemes around large ponds and wetlands. Habitat: Glyceria maxima is a wetland obligate species (plant that has occurred in wetland habitat 99% of the time it was sampled), which typically grows in rivers, streams, dams, and ponds. Glyceria maxima is a poor food-plant and nesting substrate for wetland wildlife. Flowering occurs in spring and summer. Tall Mannagrass is a rapidly establishing native species suitable for restoration of swamps, the edges of marshes, ponds, and streams, and other wetland plant communities where … Green foliage grows to 3 feet tall in full sun to part shade, forming erect tufts. Glyceria grandis: leaves with blades mostly 4.5-12 mm wide and smooth sheaths, and upper glumes 1.5-2.7 mm long (vs. G. maxima, with leaves with blades mostly 8-18 mm wide and minutely scabrous sheaths and upper glumes mostly 3-4 mm long). Agrecol Native Nursery, 10101 North Casey Road, Evansville, WI 53536. Browse pictures and read growth / cultivation information about Manna Grass, Reed Sweetgrass (Glyceria maxima) supplied by member gardeners in the PlantFiles database at Dave's Garden. Manna Grass, an excellent pond plant is great when planted in moist soils near ponds, streams, wetlands, marshes and bog areas. Tall Mannagrass Glyceria maxima. Join our friendly community that shares tips and ideas for gardens, along with seeds and plants. Glyceria maxima has been used as a forage crop. Reed sweet-grass (Glyceria maxima) is regarded as a significant environmental weed in Victoria, Tasmania, New South Wales and Western Australia. Glyceria maxima reduces plant species diversity, in particular, seed producing plants that provide food for wildlife. Leaf blades are flat with a prominent midrib and rough margins. Glyceria maxima. Aggressive, perennial, mat-forming grass (<1.9 m tall) with fibrous roots and rhizomes and an erect or lax stem. Members can view this photo in high resolution. Where is it originally from? Members can view this photo in high resolution. ... range from yellow to green in colour, with a purplish tinge. Family. Click below on a thumbnail map or name for species profiles. Plant Description Manna Grass or Glyceria-maxima, is an ornamental grass with flat, medium-green leaf blades and attractive panicles. 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