Repotting & Choosing a Pot Size: Simple Rules | Plant Magic

When to repot and how to choose the right pot size (without root rot)?

Is your plant no longer growing, does the pot dry out super fast, or do you see roots coming out the bottom? Then it's often time to repot—or to optimize your plant care. In this article, you'll learn exactly when repotting is necessary, how to choose the right pot size, and how nutrients help (without "overfeeding" your plant).

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The quick check: should I repot now?

• Roots are coming out of the bottom of the nursery pot or circling the bottom.
• The potting soil dries out extremely quickly (e.g., within 1–2 days) while your plant receives light.
• Your plant shows hardly any growth during the growing season (spring/summer), despite a good location.
• The root ball "pushes" upwards or the plant is unstable.

Tip: Repotting is easiest in spring and early summer. In winter, only repot if there are real problems (e.g., soaking wet soil or root stress).

When repotting, it's important to choose airy potting soil so that roots get enough space and oxygen to grow healthily.

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Choosing pot size: the simple rule

Usually, choose 1 size larger. This means: approximately 2–4 cm wider in diameter than the current nursery pot. A pot that is too large retains moisture for too long—which increases the risk of root rot.

Examples (handy to remember)

• Nursery pot Ø12 → decorative pot/nursery pot Ø14–16
• Nursery pot Ø17 → Ø19–21
• Nursery pot Ø21 → Ø24–26

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How to repot without stress (step-by-step plan)

1. Choose a pot with drainage (holes) or always use a nursery pot inside a decorative pot.
2. Use airy potting soil so roots get oxygen (especially for larger plants).
3. Gently remove the plant from the pot and check the roots:
   • White/light = healthy
   • Brown/soft = too wet / root stress
4. Gently loosen the outer roots a bit (do not pull aggressively).
5. New pot: layer of potting soil, place plant in, fill up, lightly press down.
6. Water a little after repotting (don't overdo it). Always let it drain well afterwards.
   
   Are you unsure if your plant is already too wet? Also read: recognizing and dealing with root rot.

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Common mistake: immediately choosing a huge pot

It feels logical ("then it can last a long time"), but in a pot that is too large, soil often stays wet for too long. The roots get too little air, which can cause the plant to decline. 1 size larger is almost always the best choice.

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When does your plant need nutrients?

Nutrients are not a "medicine" for an unhappy location, but they can help if your plant is in a good spot and wants to grow. The basic rule:

• Spring/summer: usually yes (build up slowly).
• Autumn/winter: usually no or very minimally.

How to provide nutrients without risk (simple)

• Start low: rather less than too much.
• Only apply nutrients to moist soil: never to bone-dry potting soil.
• Maintain a rhythm: for example, once every 3–4 weeks during the growing season.

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Signs of too little or too much nutrient

• Too little: slow growth, smaller leaves, paler color (provided light and water are good).
• Too much: brown edges, "burnt" leaves, white residue on potting soil, weak growth.

Unsure? Stop fertilizing for a while and focus on light + water. That usually solves more problems than extra nutrients.

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After repotting: what can you expect?

• A short "adjustment period" is normal. Sometimes leaves are less perky for a few days.
• Don't immediately move it again—give your plant rest in one spot.
• Check water extra carefully in the first 2 weeks: new potting soil often retains moisture differently.

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Frequently asked mini-questions

• Should I water a lot immediately after repotting?
  No. Give a normal amount and let it drain well. Too wet directly after repotting causes stress more quickly.
• Can I repot if my plant is already "weak"?
  Sometimes yes, especially if the soil stays constantly wet or root stress is suspected. Work extra carefully then and choose an airier mix.
• How do I know if I need nutrients?
  If your plant is doing well (light) and water is correct, but growth lags in spring/summer, then nutrients can help.

Want to make it extra easy? Check out our plant pots and our care collection. Or start with a strong, forgiving choice from our easy houseplants.

Want an extra easy start? Check out easy houseplants or our care collection.