How-to Guide
When and How to Repot a Root-Bound Houseplant
The short answer
Repot a houseplant when it's root-bound: roots circling the root ball, poking out the drainage holes or over the rim, water running straight through, or growth that's stalled. Slide the plant out, loosen or gently tease apart the circling roots (trim a few of the longest), and set it into a pot only 1-2 inches larger in diameter with fresh potting mix at the same depth it grew before.
Don't jump to a huge pot — too much extra soil stays wet and rots roots. A modest size-up plus a pot with drainage holes is the whole trick.
Signs it needs repotting
- Roots circling the root ball or growing out the bottom/over the rim.
- Water runs straight through without soaking in.
- Growth has stalled; new leaves are small; lower leaves drop.
- The plant dries out unusually fast (roots have crowded out the soil).
How to repot
- 1Ease it out — Tip the pot, support the stem base, and slide the plant out; run a knife around the edge if it's stuck.
- 2Free the roots — Loosen circling roots by hand; on a tightly bound plant, tease them apart and trim a few of the longest to spur new growth.
- 3Size up only 1-2 inches — Choose a pot just 1-2 inches larger in diameter, with drainage holes.
- 4Replant at the same depth — Set the plant at the depth it grew before, fill around it with fresh potting mix, firm gently, and water in.
→ Best time to repot is during active growth (spring/summer). Always use fresh potting mix and a pot with drainage — never a decorative pot with no hole unless it's just a cachepot.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Penn State Extension — Repotting Houseplants — Repot root-bound houseplants when roots circle the pot or grow through drainage holes; move to a slightly larger pot with fresh mix, loosen the roots, and replant at the same depth.