Repotting

Repotting Houseplants at the Start of Spring

Updated June 1, 2026 · Reference note

Spring is the common moment to repot indoor plants in Canada because it lines up with the return of longer days and faster growth. Moving a plant into fresh mix as it enters its most active period gives new roots time to spread before the plant is working hardest. Repotting in the depths of winter, when growth has stalled, gives roots little chance to recover from the disturbance.

Signs a plant has outgrown its pot

A plant rarely needs a larger pot on a fixed timetable; the cues come from the plant itself:

• Roots growing out of the drainage holes at the bottom.
• Water running straight through, as if the pot is mostly root and little soil.
• The plant becoming top-heavy or tipping easily.
• Roots circling visibly at the surface, or a dense root mass when you slide the plant out.
• Slowed growth during the active season despite adequate light and water.

Sliding a plant gently from its pot to inspect the roots is the most direct check. If the root ball holds the shape of the pot and roots wind around the outside, it is ready to move up.

Choosing a pot size

The usual approach is to step up only one size — roughly two to four centimetres wider in diameter. A pot that is far too large holds more soil than the roots can use, and that excess mix stays wet, which works against the watering balance described in the winter watering note. A drainage hole is important so excess water can escape.

Step up gradually. A small plant dropped into a very large pot often struggles, because the surrounding wet soil drains and dries slowly.

A step-by-step sequence

1. Water the plant a day before so the root ball holds together and the plant is not stressed.
2. Prepare the new pot with a layer of fresh potting mix in the bottom.
3. Ease the plant out by tipping the old pot and supporting the base of the stems.
4. Loosen the outer roots gently; tease apart any tightly circling roots.
5. Set the plant in the new pot so the soil surface sits at the same level as before.
6. Fill around the sides with fresh mix, firming lightly to remove large air gaps.
7. Water thoroughly and let the pot drain completely.

After repotting

A freshly repotted plant benefits from a settling period out of harsh direct sun while roots take hold. It is normal to hold off on fertiliser for a short while, since fresh potting mix usually carries some nutrients and tender new roots can be sensitive. Resume normal care once the plant shows new growth.

Continue reading

Fresh mix changes how a pot holds water, so revisit Watering Houseplants Through a Canadian Winter after repotting, and Reading Indoor Light Through Canadian Seasons for placing a newly potted plant.

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General public reference: university extension and botanical garden horticulture pages provide repotting guidance applicable to common houseplants.