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Repotting is one of those jobs that gets put off too long, then done in a panic when the plant is already stressed. The honest version is simpler: most houseplants tell you they’re ready, and the work itself is roughly fifteen minutes if the timing is right.
How to tell a plant is pot-bound
University extension describes the visible signs clearly. The University of Maryland Extension lists roots encircling the pot perimeter, tight masses of roots that often fill the pot and sometimes come out, and leaves and stems showing tip dieback or marginal necrosis (browning) as classic indicators (University of Maryland Extension).
Another practical sign on the same page: water passes through the pot too quickly and isn’t absorbed adequately (University of Maryland Extension) — there’s more root than soil to hold any water.
Illinois extension adds a behavioural sign: a pot-bound plant wilts between waterings even when you’re watering on schedule (Illinois Extension), which is the same condition described another way.
If those brown tips or that drooping lined up with watering you know you did, the pot is usually the real story.
When to do it
Illinois extension’s recommended timing is spring or early summer, when the plant is in active growth and recovers fastest from the disturbance (Illinois Extension). You can repot at other times if the plant is in trouble — root-rot rescue doesn’t wait for spring — but a healthy upgrade goes most smoothly in the active-growth window.
How to handle the roots
The biggest mistake we see is leaving the root mass as a brick when it comes out of the old pot. University of Maryland Extension is explicit: “the tight root mass should be loosened by hand or cut away to allow the roots to spread as they grow” (University of Maryland Extension).
If a few large roots have spiralled around the inside of the old pot, tease them outward or cut them — left in a circle, they keep growing in a circle and the plant never establishes properly.
Pot size
Move up one pot size — typically about 1–2 inches wider than the current pot. (General houseplant practice; the cited sources confirm signs and timing but don’t state a pot-size rule.)
Going much bigger is tempting and is the second classic mistake: a disproportionately large pot holds far more wet soil than the root system can drain, which is a textbook setup for root rot. (Also general practice.)
Fresh mix and finishing up
Use a light, well-draining houseplant mix, settle the plant at the same depth it was at before, water it in once to settle the soil around the roots, then don’t fertilise immediately — let it recover for a few weeks first. Pick the feeding routine back up per our fertilizing guide.
For the rest of the basics, see how often to water houseplants and houseplant light requirements. If something does start going wrong after the repot, the troubleshooting hub is where to start. The companion guide for new plants is how to propagate houseplants in water; the full hub is Propagation and Repotting.