Boston fern care
Nephrolepis exaltata — also called Sword fern. Everything below is the same data Plantroster uses to schedule care for this species.
Care at a glance
| Light | Bright indirect. Tolerates medium. No direct sun. |
|---|---|
| Water | About every 3 days in summer, every 6 in winter. Let the top 0.25" dry first. |
| Soil | Standard houseplant mix — 7 parts potting mix, 3 parts perlite |
| Humidity | At least 55%, happiest near 80% |
| Temperature | 60–78°F. Cold damage below 40°F; heat stress in sun above 90°F. |
| Feeding | Every ~45 days while actively growing. Nothing in winter. |
| Repotting | Every 2 years, or when roots circle the pot |
| Tap water | Tolerates tap water |
| Pets & children | Non-toxic to cats and dogs. |
What people get wrong about boston fern
Massive leaf drop in a heated room in winter is dry air, not disease. It genuinely needs humidity above 50%.
Common problems
Watch for spider mites, scale, mealybugs. Check leaf undersides monthly — backlighting a leaf against a window is the fastest way to catch mite webbing before an infestation takes hold.
Plantroster tracks this plant's watering, feeding and repotting cadence against your actual weather — and tells you when a cold night or heatwave means moving it.
Open PlantrosterBoston fern FAQ
How often should I water a boston fern?
Roughly every 3 days in the growing season and every 6 days in winter, but treat that as a starting point rather than a rule — light, pot size and your home's warmth all shift it. Never let it dry out. This is the plant that actually does need consistent moisture and real humidity.
Is boston fern toxic to cats and dogs?
No. Non-toxic to cats and dogs.
How much light does a boston fern need?
Bright indirect is ideal, and it will cope with medium. No direct sun.
Why does my boston fern have brown tips?
Boston fern is not fluoride-sensitive, so brown tips here usually point to inconsistent watering or fertilizer salts built up in old soil. Flush the pot thoroughly and keep to a steadier watering rhythm.
What soil is best for boston fern?
Standard houseplant mix: 7 parts potting mix, 3 parts perlite. Bagged potting soil alone stays too wet in an indoor pot; perlite fixes the drainage.
Other plant guides
General horticultural guidance, not a substitute for inspecting your own plant. Toxicity notes are a starting point — if a pet or child has eaten part of a plant, contact a vet or poison control rather than relying on this page.