When (and How) to Repot Your Houseplants — A Spring Guide

Why spring is the right time to repot

As days get longer and indoor temperatures stay steady, your houseplants wake up from winter dormancy and start pushing fresh roots and leaves. That growth surge is exactly what helps a plant recover from the small shock of being moved into a new pot. Repot in mid-winter or late autumn and the plant just sits there for weeks, more vulnerable to rot. Repot now — between roughly March and early June for most homes — and roots colonise the new soil within days.

How to tell if your plant actually needs repotting

Repotting is one of those things people do too often and not often enough. The tell-tale signs are surprisingly consistent:

• Roots growing out of the drainage holes — the most obvious sign. Tip the pot and look underneath.
• Water runs straight through when you water — soil has broken down and roots have replaced it.
• The plant dries out within 1–2 days of a thorough water — there's not enough soil left to hold moisture.
• Visible roots circling the surface — slide the plant out and you'll see a dense web spiralling around the rootball.
• Stunted new growth in spring despite good light and water — often a root-bound plant.

If none of these apply, leave it alone. Plants like Monstera, Sansevieria, and most succulents prefer to be slightly snug and bloom or push more leaves when their roots feel a bit constrained.

How big should the new pot be?

The single most common repotting mistake is jumping up too many sizes. Aim for a pot that's 2–3 cm (1 inch) wider in diameter than the current one — no more. Too much fresh soil around a small rootball stays wet for too long, which is the fastest way to cause root rot.

Drainage holes are non-negotiable. A decorative pot with no hole is fine as a cover pot, but the working pot inside must drain. Terracotta is excellent for plants that prefer to dry out (succulents, hoyas, snake plants); plastic or glazed ceramic works well for tropicals that like consistent moisture (calatheas, ferns, peperomias).

What you'll need

• A pot one size up with drainage holes
• Fresh potting mix appropriate for your plant (see our succulent soil guide for gritty mixes; standard houseplant compost + a handful of perlite works for most aroids and tropicals)
• Clean, sharp scissors for trimming damaged roots
• A bucket or tray for the mess
• Water

The step-by-step process

1. Water the plant lightly the day before. A slightly damp rootball slides out cleanly; a bone-dry one fractures.

2. Tip and ease the plant out. Squeeze plastic pots gently or run a knife around the inside of ceramic ones. If it's properly stuck, lay the pot on its side and tap the rim — never yank by the stem.

3. Inspect the roots. Healthy roots are firm and white or light tan. Mushy, dark, smelly roots are rotten — trim them off with clean scissors. If the rootball is one solid disc of circling roots, gently tease the bottom and sides loose with your fingers, even if it tears a few strands. New roots will replace them within weeks.

4. Add a layer of fresh mix to the new pot — enough that the top of the rootball will sit 1–2 cm below the rim. Don't bother with rocks at the bottom; that's an old myth that actually worsens drainage.

5. Position and backfill. Sit the plant in the centre and fill around the sides with fresh mix, gently firming with your fingers (not packing it down hard — roots need air pockets).

6. Water thoroughly until you see water draining from the bottom, then let it drain fully. Don't fertilise for at least 4–6 weeks — fresh compost has plenty of nutrients, and feeding stressed roots can burn them.

7. Put the plant back in its usual spot and resist the urge to over-water for the next two weeks. A repotted plant is recovering, not thirsty.

Common mistakes to avoid

• Pot too big — leads to soggy soil and root rot. One size up is plenty.
• Repotting a sick plant in the hope it'll fix things — usually makes things worse. Diagnose the actual problem first (often watering or light).
• Burying the stem deeper than it was — encourages stem rot. Keep the soil line where it was on the old pot.
• Fertilising right after — wait at least a month.
• Using garden soil — too dense, often contains pests and pathogens. Always use proper potting mix.

What about LECA, semi-hydro, and self-watering pots?

If you're moving a plant from soil to LECA (clay pebbles) or a semi-hydro setup, spring is also the ideal time — the plant has the energy to grow water roots. Rinse all soil off the roots, trim any rot, and submerge in plain water for a week or two before introducing nutrients. We'll cover this in more detail in a future guide.

Show off your spring repots

Just finished a big repot? Post a before-and-after photo in the Aiya's Garden forum — there's nothing more satisfying than a freshly potted plant in clean soil. You can also use the Garden tracker to log when each plant was last repotted, so you know who's due next year.

Got questions about a tricky plant? Drop a photo in the forum's Questions category and the community will help you decide whether to repot or wait.