Planting notes. Foxtail fern is hardy to about 20 degrees Fahrenheit; it's easily grown as a houseplant as well. Outside, the plant grows well in full sun, with light afternoon shade in hotter climates. Native to the coast, foxtail fern grows well in rocky, sea-coast conditions and prefers moderately moist soil, rich in compost. In temperate climates you can plant foxtail fern pretty much year-round. Mulch and water it well after planting to establish strong roots. Foxtail fern grows quickly and can be divided every few years in spring. Remove spent foliage before new growth emerges each year. Too much or too little water — even too much sunlight — can cause yellowing leaves or leaf drop. If you notice this, adjust your care accordingly.