A houseplant does not need a new pot just because a certain amount of time has passed. Better signs include roots filling the container, degraded potting mix, water racing through too quickly, or a healthy plant that can no longer stay hydrated on its normal schedule.
Look at the roots, not just the top growth
Roots massed through drainage holes, circling densely around the root ball, or displacing most of the potting mix indicate crowding. One stray root through a hole does not by itself require repotting.
Degraded potting mix can also justify repotting
If the mix is compacted, stays wet for a long time, or has pulled away from the pot and no longer wets evenly, refreshing it may be useful even without a much larger container.
Do not confuse watering problems with a need for a bigger pot
Yellow or wilted leaves can also come from overwatering, low light, or unhealthy roots. Checking moisture and roots before sizing up prevents adding more wet soil around an already stressed plant.
Timing matters less than plant condition, but avoid unnecessary stress
Many houseplants recover most easily during active growth, although root rot or a broken pot can require action sooner. Repot when there is a clear reason rather than on an automatic calendar.
Sources
- University of Minnesota Extension — Houseplants — Houseplant care, roots, potting mix, watering, and repotting.