Psilotum nudum, Psilotum triquetrum

USDA Plant Hardiness Zone Map

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Psilotum nudum (Whisk Fern) can be placed in a shady location and grown in USDA Hardiness Zones 8-10. It should be grown in moist soil in semi-shade and watered regularly to keep the roots moist and the air humid. Soil should be well-draining, but should be kept evenly moist in Spring and Summer, and dry in winter. Overwatering can lead to root rot. Re-potting this fern should be done in Spring.

This species of Psilotum can also be grown in a pot and brought indoors for colder regions. The pot should have drainage holes and should be filled with a combination of potting soil, orchid bark, and sphagnum moss. Water regularly, but keep the soil lightly moist and never soggy. To prevent root rot, do not let the plant sit in a pool of water. If grown outside, the pot should be brought indoors if the temperature drops below freezing.