Glyceria maxima, better known as swampgrass is an ornamental aquatic herb widespread throughout much of the globe, which often takes on an infesting character.
It has erect or slightly arched stems, which depart from large rhizomatous or stoloniferous roots, which tend to form large, very thick and dense tufts; the stems of the bog grass grow up to 50-100 cm, are green, or bluish green, in the Variegata variety they are variegated with yellow-cream. The leaves of this variety are linear, a few millimeters wide, rough and rigid, green or variegated; at the apex of the stems there are thin panicles made of small flowers in the summer, followed by small elongated seeds. Sometimes the submerged stems of these specimens are rooted to the internodes.
The plants belonging to the Glyceria maxima variety are very vigorous and can be planted both in the sun and in the shade; the glyceria maxima do not fear the cold and can withstand temperatures close to -20 ° C, although often during the winter they go into vegetative rest and the aerial part completely dries up.
They don't even fear the summer heat. They settle down near the water gardens, on the banks of ponds, or even submerged; over the years they tend to form large colonies, it is therefore good to keep the tufts contained, to prevent them from invading the pond or the lake where they were placed, becoming a weed and difficult to contain variety.
marsh grass specimens grow without problems in any soil, even submerged constantly by stagnant water; in general, when marsh grass plants are placed in very rich and soft soils, they tend to become weeds very quickly. These aquatic plants can also develop in emerged soils, as long as they are close to water courses so as to have a high degree of humidity that allows the development of this kind of shrub.
It is a good idea to check that the area in which these plants are grown has a soil capable of maintaining good humidity, otherwise the development of these shrubs will be rather limited.
As for watering, as it is easy to imagine, being an aquatic variety, this kind of plant needs a constant supply of water, as long as it is not already inside a pond or submerged soil. If it is grown in a container it is necessary to check that the humidity remains always high, with the foresight to replace the stagnant water present in the container with a regular frequency, every 15/20 days.
The multiplication of marsh grass to obtain new specimens usually occurs by division; It is possible to take portions of the tufts, or the basal shoots that normally develop at the foot of the plant. Given the high diffusion and the ease of propagation of this kind of plant, it is very easy to obtain new seedlings.
Marsh grass - Glyceria maxima: Pests and diseases
The specimens belonging to this tree species are particularly hardy and resistant and, in general, are not affected by pests and diseases.