the genus osmunda includes about ten species of deciduous ferns, widespread in the American continent and in Asia. They form thick tufts, 100-150 cm high, consisting of long arched, smooth stems, the young shoots are covered by a thin brown hair; Osmunda cinnamomea has dimorphic fronds: the fertile fronds are bluish-green in color, they turn brown in autumn, before the winter rest; the fertile fronds are light green in color, similar in shape to a panicle, they become intense cinnamon when the spores are mature, and therefore dark in color with the arrival of cold weather. The stems have a round section, are bipinnate, with small oval or lanceolate leaves, rough to the touch. The tufts start from the roots, large fleshy rhizomes, which widen quite quickly.
The florid fern plants, or f. marshes have a rather slow growth, are quite rustic and can be found easily even in the wild; before planting the florid fern in our aquatic garden it is good to consider the dimensions that f. of the marshes take over the years. This plant is very similar to O. regalis, widespread even in the humid areas of our country. The dried fronds of these ferns were, and are, used in soils for epiphytic plants.
For the best exposure of the florid fern it is good to place it in a shady or partially shaded place, even very bright, provided it is not directly exposed to sunlight.
Generally the osmunda cinnamomea, also known as f. of the marshes, they do not fear the cold very much, while they can be ruined by excessively hot summers; It is therefore advisable to place the le osmunda cinnamomea in a well-ventilated place and completely shade the specimens placed in partial shade in the hottest periods of the year.
Plants belonging to the variety of osmunda cinnamomea generally they love loose, acid and rich in organic matter soils; it is advisable to place it near a water garden, so that the soil can enjoy constant humidity, especially during hot and dry periods.
If desired, it is also possible to cultivate the osmunds in a container, considering however to provide a very large pot and to water very frequently, avoiding letting the soil dry and constantly checking that there is a correct degree of humidity inside the pot, without however that water stagnations form which could cause problems.
In nature, florid fern plants propagate through spores; the osmunds also produce numerous suckers, which can be taken in early spring; wishing to fall in the autumn it is also possible to divide the rhizomes, which are immediately buried in the chosen place for cultivation, without proceeding with the first planting in a sheltered container.
Fern fern, F. of the marshes - Osmunda cinnamomea: Pests and diseases
The florid fern plants are robust and resistant and, in general, they are not attacked by pests or diseases. In excessively basic soils they may be subject to chlorosis; in this case, there are specific products on the market to add to the water to regulate the acidity of the soil and guarantee the correct ph to the specimens.