Most plants need repotting every one to three years, and they announce it if you know the signals. Here's how to confirm, when to do it, and the repotting method that doesn't set the plant back a month.
Nora Finch
Roots escaping through the drainage holes - or circling visibly on the surface - are the headline sign: the root system has filled the pot and gone looking for more. Second: water runs straight through and out in seconds, because the pot is more root than soil and there's nothing left to absorb it. Third: the plant needs watering twice as often as it used to, same reason.
Fourth: growth has stalled in growing season despite good light and care, or the plant has become so top-heavy it tips its own pot. Any one signal is a hint; two or more is a diagnosis. For confirmation, the direct check beats them all - slide the plant out and look: a dense spiral of circling roots with little visible soil means rootbound, repot. Plenty of soil and modest roots means the problem is something else.
Spring through early summer is repotting season - the plant is entering active growth and rebuilds disturbed roots quickly. A rootbound plant repotted in March shrugs it off in two weeks; the same job in November can sulk all winter. Exceptions for emergencies: root rot, a shattered pot, or soil that repels water get repotted whenever they're discovered.
Also worth waiting: a plant that just came home from the shop (let it acclimate two or three weeks first), anything in bud or full bloom (repotting aborts flowers), and the handful of plants that genuinely flower better slightly rootbound - peace lilies, spider plants, snake plants, and most orchids among them. Rootbound is a spectrum: 'snug' is fine for those; 'solid root spiral drinking nothing' is not fine for anything.
Choose a pot 2-5 centimeters wider in diameter than the current one. The leap to a much bigger pot feels efficient and backfires reliably: all that root-free soil holds water the plant can't drink, stays wet for weeks, and starts rot. Big jumps are how a successful repot becomes an overwatering casualty.
Make sure the new pot drains (hole, always), and match material to your habits - terracotta dries faster and suits heavy-handed waterers; plastic and glazed ceramic hold moisture longer. If the plant is already at the size you want, 'repotting' can mean same pot, fresh soil: trim the outer third of the rootball, prune the top proportionally, and return it with new mix.
Water the plant a day before (moist rootballs slide out; dry ones crumble, soaked ones smear). Tip the pot sideways, support the stem base between your fingers, and ease the plant out - squeeze flexible pots, or run a knife around the inside of rigid ones. Loosen the rootball's outer surface with your fingers and gently unwind or slice through any circling roots; left alone, they keep spiraling forever and can eventually strangle the plant.
Set a few centimeters of fresh mix in the new pot, sit the plant so it rests at the same depth it grew before (an overly buried stem rots), and fill around the sides, firming lightly - air pockets collapse later and sink the plant, but packed-hard soil defeats the fresh start. Leave a couple of centimeters of rim as a watering well, water thoroughly until it drains, and stop.
A repotted plant pauses - some droop or a shed leaf in week one is transplant shock, not failure. Park it in its usual light (or slightly gentler, out of harsh direct sun), don't water again until the top of the soil dries, and hold off fertilizing for four to six weeks: fresh mix carries nutrients, and fertilizer on disturbed roots burns.
Resist the urge to fuss. The plant is rebuilding root contact below the surface, and new top growth - usually within a month in season - is the all-clear. From there, the cycle restarts: fast growers and young plants want a size-up every year or so; mature slow growers go two to three years, often needing only a spring top-dressing of fresh mix in between.
Rarely - the genuine risks are jumping several pot sizes (overwatering trap), burying the stem deeper than before, repotting a stressed plant in midwinter, or heavy fertilizing right after. Follow the one-size-up rule and same-depth rule and the odds are strongly in your favor.
No - keep the rootball largely intact and just loosen the outer surface and free circling roots. Full bare-rooting is reserved for rot treatment and orchids. The exception: if the old soil is pest-ridden or sour-smelling, remove as much as comes away easily.
Probably not - a droopy, sulky fortnight is standard transplant shock. Keep it in good indirect light, water only when the soil dries, and wait. Worsening past two or three weeks, or a mushy stem base, points to overwatering or too big a pot jump.
Usually not immediately - let it settle in for two or three weeks first. Repot sooner only if it's visibly rootbound, waterlogged in a pot with no drainage, or the soil smells sour. Many shop plants are happy in their nursery pot for months; just slip it inside a prettier cachepot.
