Asplenium scolopendrium (syn. phyllitis s.) 'CRISPUM'

Hart’s tongue fern is an attractive species with large, evergreen leaves. It was widespread in Europe, West Asia, and North America but in some locations including Czech Republic it is already listed among endangered species.

Crispum is a hart’s tongue fern variety from the undulatum group. Its narrow leaves are similar to Angustatum variety but exhibit gently crested margins. They are deep green, 30-40 cm long, dark green, highly glossy, and withstand deep frost without damage, only during very cold spells they may wilt and lie on the ground awaiting warmer weather when they straighten up again.

It is cultivated in semi-shaded or shaded locations with moist but well-drained, cool soil of preferably alkaline pH (lime-based) but will even grow in slightly acidic soil. It needs deep soil rich in organic matter which may sound strange when you see it growing happily in a crevice of a rock, but you never know how deep or moist it is there. These ferns respond well to fertilizing: the more nutrients – the bigger leaves. Though they can withstand heavy frosts we suggest cutting off all leaves in spring to encourage new growths. Hardy to about -29 °C (USDA zone 5).

Last update 13-02-2010; 01-12-2021