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Boston Fern (Nephrolepis)

Plant care guide

How to care for Boston Fern (Nephrolepis)

Nephrolepis exaltata (Cotton Candy, Emina), Nephrolepis obliterata (Jester's Crown), Nephrolepis cordifolia (Lemon Button)

Care level: ModerateNon-toxic to cats & dogs

Boston ferns and their cousins are the classic lush, arching ferns, with soft fronds that spill over the pot edge and make any room feel greener. Give them steady moisture and some humidity and they reward you with a full, fountain-like shape that keeps pushing out new fronds.

Also known as: Boston fern, sword fern, Cotton Candy fern, Emina fern, curly Boston fern, Jester's Crown fern, Kimberly Queen relative, Lemon Button fern, button fern, Nephrolepis

Just arrived? Your first week at home

  1. Open the box right away, lift the fern out by the pot (not the fronds), and gently fluff the fronds so they are not pressed flat.
  2. Feel the soil an inch down; if it is dry, water thoroughly until it drains, and if it is still damp, wait a day or two.
  3. Set it in bright, indirect light, such as a few feet back from an east window, away from heat vents, radiators, and cold drafts.
  4. Expect a few yellow or crispy fronds from the trip; snip them off at the base and focus on the new growth.
  5. Raise humidity right away with a pebble tray or by grouping it with other plants.
  6. Leave it in its nursery pot for about two weeks before repotting so it can settle in.

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Light

Boston ferns like bright, indirect light, similar to a spot a few feet from an east window or set back from a bright south or west window behind a sheer curtain. Direct afternoon sun will scorch and bleach the fronds. In low light the plant survives but grows thin and sheds leaflets.

Water

Keep the soil evenly moist, like a wrung-out sponge, but never soggy. Check every few days by pushing a finger an inch into the soil and water when the top inch just starts to feel dry, which is often every 3 to 5 days in summer and a bit less in winter. Crispy brown fronds and shedding leaflets mean it dried out; yellowing fronds with soggy soil point to overwatering or poor drainage.

Humidity

These ferns love humidity, ideally 50 percent or higher. A bathroom with a window, a pebble tray, grouping with other plants, or a small humidifier all help, especially in winter when heating dries the air. Misting gives only a brief boost and is not a substitute for steady humidity.

Temperature

Aim for 60 to 75 F and keep it above 55 F. Avoid placing it near heaters, fireplaces, or air conditioner vents, and keep it off cold windowsills in winter. Sudden temperature swings trigger heavy frond drop.

Soil & repotting

Use a light, peat- or coir-based potting mix that holds moisture but drains well; adding a little orchid bark or perlite keeps it airy. Repot in spring when roots fill the pot, moving up just one pot size, and always use a pot with drainage holes. Large plants can be divided at repotting time.

Feeding

Feed with a balanced liquid fertilizer at half strength about once a month from spring through late summer. Skip feeding in fall and winter when growth slows. Too much fertilizer causes brown frond tips, so err on the light side.

Troubleshooting common problems

  • Crispy brown frondslow humidity or dry soil; water more consistently and add a pebble tray or humidifier.
  • Leaflets shedding all over the floorusually dry air, underwatering, or a recent move; keep conditions steady and it will push new fronds.
  • Yellow fronds with wet soiloverwatering or a pot without drainage; let the top inch dry slightly and check drainage holes.
  • Pale, washed-out frondstoo much direct sun; move it farther from the window.
  • Tiny webbing or speckled frondsspider mites, which love dry air; rinse the plant in the shower and raise humidity.

Tips to help it thrive

  • Hanging baskets and plant stands show off the arching fronds and keep them out of reach of playful pets.
  • Runners that root along the soil surface can be pinned into a new pot to start a fresh plant.
  • In summer, a shady porch with no direct sun makes a great vacation spot; bring it in before nights drop below 55 F.
  • Trim old, faded fronds at the soil line regularly to keep the center open and encourage fresh growth.

Pet safety

Boston Fern (Nephrolepis) is listed as non-toxic to cats and dogs by the ASPCA. As with any houseplant, it's still best to discourage pets from chewing the leaves, which can cause a mild upset stomach.

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