Asplenium scolopendrium (syn. phyllitis s.) 'ANGUSTATUM' hart's tongue fern

Angustatum is a narrow-leaved variety of hart’s tongue fern. Its leaf blades are almost half the width of the species which makes them look longer. It is the only hardy fern with entire foliage, suitable for our C.E. climate though it bears close resemblance to its subtropical relatives. Its evergreen leaves are not divided into small, individual leaflets forming a showy frond as in case of other fern species, but make one wide, bright green, and glossy leaf. The species has smooth, slightly wavy margins while cultivars vary significantly. These leaves can take deep frost without damage, only during very cold spells they 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