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Polystichum munitum Giant holly fern Evergreen fern (1 Page of 5) The Polystichum munitum plant species is found in Western N. America - Alaska to California. It is a member of the Dryopteridaceae family. Common gardeners may know the plant as Giant holly fern. Some home gardeners know the variety as Aspidium munitum. Cultivation | Propagation | General Uses Medicinal | Edible Uses Latin Name: Polystichum munitum Common Name: Giant holly fern Family: Dryopteridaceae Author: (Kaulfuss.)C.Presl. Known Hazards: Although we have found no reports of toxicity for this species, a number of ferns contain carcinogens so some caution is advisable[200].
Many ferns also contain thiaminase, an enzyme that robs the body of its vitamin B complex. In small quantities this enzyme will do no harm to people eating an adequate diet that is rich in vitamin B, though large quantities can cause severe health problems. The enzyme is destroyed by heat or thorough drying, so cooking the plant will remove the thiaminase[172]. Mature Height: 1 Mature Width: 0.3 Habitat: There are two distinct varieties, var munitum grows in moist coniferous woods, var imbricans grows in rock crevices and rocky soils in dry coniferous soils[60]. Forms extensive colonies[187].
Cultivation Notes: Very hardy and easily grown in light shade in any reasonable soil[187]. Prefers a sandy humus-rich soil in a shady position that is moist even in winter[1]. Tolerates part sun for up to 6 hours a day if the soil remains moist[200]. It is possible that the var imbricans will succeed in drier soils[K]. Prefers a pH in the range 6.5 to 7.5[200].
Members of this genus are rarely if ever troubled by browsing deer[233].
A very ornamental plant[1], it is a robust clump-forming species[187].
Remove old fronds from the plant in the spring because they may harbour fungal diseases[200].
For further Polystichum munitum gardening information click on one of the blue links below Cultivation | Propagation | General Uses Medicinal | Edible Uses
The information above has been supplied solely via the hard work and dedication of the team at 'Plants for a Future'. View their bibliography

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