At a glance
- Light
- Medium / indirect light
- Typical interval
- Every 3 to 5 days (summer)
Every 7 to 11 days (winter) - Climate
- 18–24 °C
- Humidity
- 60–80 %
- Pet safety
- Pet-safe (non-toxic)
- Scientific name
- Nephrolepis exaltata
When and how much water
Water Boston fern when the top 2 cm of soil feel dry: ferns don’t like drying out. In summer that’s typically every 3 to 5 days. In winter, slow down to every 7 to 11 days. Use room-temperature water and let any excess drain. Never leave the pot sitting in standing water.
Light and placement
Boston fern thrives in bright, indirect light. Direct midday sun can scorch the leaves. Place it 1–2 meters back from an east or west window, or behind a sheer curtain on a south window.
Feeding
Feed Boston fern every 30 days while it’s actively growing. Use a balanced liquid houseplant fertilizer at half the strength on the label, and only on soil that’s already damp. Feeding dry roots can scorch them.
When growth pauses, skip the fertilizer and let it rest.
Temperature & humidity
Boston fern is comfortable between 18 and 24 °C. Below 10 °C the leaves start taking damage, so keep it clear of cold drafts and unheated rooms.
It does best at 60–80% humidity. Misting every 2 days helps in dry rooms.
Common problems
Yellowing, drooping, and dry edges often point to watering or drainage. Compare the signs before changing the routine.
Find what’s wrong
Toxic to pets?
No. Pet-safe.
Boston fern is non-toxic to cats and dogs. Safe to keep in a home with pets.
Pet-safety information in the JungleBook uses ASPCA reference data where available. It is reference information, not veterinary advice.
Common questions
How often should I water a Boston fern?
Water your Boston fern (Nephrolepis exaltata) when the top 2 cm of soil feel dry: ferns don’t like drying out. In summer, that’s typically every 3 to 5 days. In winter, slow down to every 7 to 11 days.
How much light does a Boston fern need?
Boston fern thrives in bright, indirect light. Direct midday sun can scorch the leaves. Place it 1–2 meters back from an east or west window, or behind a sheer curtain on a south window.
Is Boston fern safe for cats and dogs?
Boston fern is non-toxic to cats and dogs. Safe to keep in a home with pets.
Why are my Boston fern’s leaves turning yellow or drooping?
On a Boston fern, yellowing and soft growth usually mean overwatering: watch for yellowing fronds, mushy crown, or root rot. Let the soil dry further between waterings and check drainage. If you see crispy frond tips, browning fronds, or dropping leaflets instead, it’s likely thirsty. Water a little more often. With Botanicaly Pro, Botanicaly Bot can help assess visible signs from a photo and suggest possible causes.
Sources4 references
- Royal Botanic Gardens, Kew: Plants of the World OnlineTaxonomy · accepted name · native range · habit
- North Carolina State University Extension Gardener Plant ToolboxHouseplant context · light · temperature · humidity · moisture · winter · spores · pests
- Royal Horticultural SocietyLight · compost · moisture · pH · humidity · fertilizer · winter · pests · rot
- ASPCA Animal Poison ControlBoston fern record for Nephrolepis exalta bostoniensis, a cultivar/botanical spelling variant rather than the straight species record
Last reviewed: 2026-09-21
