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INDOORPLANTCARE
Repotting · Boston Fern

How to Repot a Boston Fern

Every 1–2 years. Best time: Spring or early summer. New pot size: 1–2 inches larger.

Frequency
Every 1–2 years
Best season
Spring or early summer
Pot size
1–2 inches larger
Soil mix
Standard potting mix with 30% peat or compost added for water retention. Boston ferns prefer evenly moist (not wet) soil.

Signs your Boston Fern needs repotting

Roots and runners growing out of drainage holes; the rootball mounds above the pot rim; the center of the plant looks bare while the outer fronds are full.

Step-by-step

  1. 1
    Water thoroughly 24 hours before.
  2. 2
    Slide out the rootball. Expect a dense mat of fine roots and runners.
  3. 3
    BEST time to divide: use a serrated knife (a bread knife works) to cut the rootball into 2–4 wedge sections.
  4. 4
    Pot each section in fresh mix at the same depth.
  5. 5
    Water thoroughly. Place in high humidity (60%+) and bright indirect light.
  6. 6
    Trim any damaged fronds. Expect some frond loss for 2 weeks; new growth at the center signals recovery.

What kills Boston Fern after repotting

  • Letting humidity drop below 50% during recovery — fronds crisp fast
  • Direct sun — burns recovering fronds within hours
  • Cutting sections too small (less than 1/4 of the original) — small divisions struggle to establish

Botanical reference: NC State Extension — Nephrolepis exaltata

For full Boston Fern care, see the Boston Fern care guide. For the basics that apply to any plant, see how to repot a plant (general).