Boston fern care is easy when you know how. Also known as the sword fern, the Boston fern is an elegant houseplant that will create a lush look in your home, and with its fountain of bright green frilly foliage it makes one of the best indoor plants.
The arching leaves, known as fronds, can grow up to 3ft in length, given the right conditions, and make a beautiful feature when cascading from a hanging basket or displayed in a pot on a tall stand.
Boston ferns (Nephrolepis exaltata) hail from the forests of South and Central America, and consequently prefer a warm humid atmosphere that replicates their native habitat. However, while this fern comes from swampy areas, it is an epiphyte, which means it lives among the branches of trees, so it will not be happy sitting in soggy soil.
You may find the Boston fern listed under Nephrolepis exaltata ‘Bostoniensis’ which is a popular plain green variety. Or try the variegated form N. exaltata ‘Tiger Fern’, with its unusual yellow-streaked foliage, which is also one of the best indoor plants.
3 essential Boston fern care tips
'It’s readily available, relatively cheap and offers a great way to enjoy lush green foliage at home,' he says.
1. Find the right light for your Boston fern
Tom Knight says this fern likes a bright or slightly shaded position: 'The Boston fern is really versatile. You can grow it on a north- or east-facing windowsill or in a sunnier room, setting it back a little.
'Just make sure you avoid spots in very low light, or in harsh sunshine such as on a south-facing sill,' he says.
A houseplant enthusiast that has run Ourhouseplants.com for the last 10 years. A popular website for anyone looking for success with indoor gardening or help getting their houseplants to thrive.
2. Water and feed as required
Make sure your fern’s compost is consistently moist from spring to fall. But, as with many houseplants such as the yucca or Chinese money plant, guard against soggy, wet soil by planting it in a pot with drainage holes in the base.
Tom adds: 'Mine sits on an east-facing windowsill and I need to water it once a week, sometimes more in very warm weather.' Reduce watering in winter, applying moisture only when the top of the compost feels dry.
If you are displaying your Boston ferns in a living or dining room, or as bedroom plant, where humidity levels are low, also be prepared to mist the leaves a couple of times a week. Or stand the plant in its pot on a tray filled with pebbles and topped up with water. Like this oval black plastic humidity tray at Walmart.
Feed with a half-strength liquid fertilizer once a month from spring to early fall to keep the foliage green and lush.
3. Keep the atmosphere moist
Like orchids, Boston ferns like humidity. The fronds may turn brown if the compost or atmosphere is too dry. Water well, making sure that you don’t overwater. As with pothos care, soggy compost can result in wilting or yellowing leaves and may cause the roots and fronds to rot.
Ideally, water your fern over a sink and leave to drain before replacing it in its waterproof container. If the atmosphere is dry, mist the leaves regularly.
If you find dark brown spots beneath the fronds of a Boston fern, do not panic. These are not a pest or disease but the ‘spores’ by which ferns reproduce.
Can I put my Boston fern outside?
Boston fern is hardy enough to grow outdoors in USDA zones 9 - 11. Position it in partial shade, out of the midday sun. If you've been growing your Boston fern as an indoor plant then introduce it to the outdoors gradually.
Start by bringing it outdoors during the day and taking it back in at night for two weeks. It will survive in temperatures down to 50˚F.
Boston ferns need to be grown in the optimum light conditions, which mimic its native forest habitat. It dislikes damp soil but enjoys a humid atmosphere. The right care comes easy once you've found the best placement for it.
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Zia Allaway is a garden book author, editor, and journalist, and writes for a range of gardening and women’s magazines, including Easy Gardens, Homes & Gardens and Livingetc, as well as The Guardian and The Daily Telegraph newspapers. She has also written books for the Royal Horticultural Society and Dorling Kindersley publishers, including Eco-Gardening, Compost, Low Maintenance, Practical House Plant Book, Practical Cactus & Succulent Book, Indoor Edible Garden, What Plant Where, and the Encyclopedia of Plants and Flowers.
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