One of the most common questions new plant owners ask is, "What size pot should I move my plant into?"
Choosing the correct pot size is more important than many people realise. A pot that's too small can restrict root growth, while one that's too large can stay wet for too long, increasing the risk of root rot.
In this guide, we'll explain exactly how to choose the right size nursery pot for your houseplant.
The Golden Rule: Only Go One Size Up
For most houseplants, the safest approach is to increase the pot diameter by 2–5cm (around 1–2 inches) each time you repot.
For example:
- 9cm pot → 11cm or 12cm pot
- 12cm pot → 14cm pot
- 14cm pot → 16cm or 17cm pot
- 19cm pot → 22cm or 23cm pot
This gives the roots enough room to grow without surrounding them with excessive amounts of damp soil.
Why Not Choose a Much Bigger Pot?
It might seem sensible to give your plant lots of room to grow, but oversized pots often cause problems.
When there's too much soil around a small root system:
- The soil stays wet for longer.
- Roots struggle to absorb all the moisture.
- Air circulation decreases.
- The chances of root rot increase.
Gradually increasing pot size usually produces healthier, stronger plants.
Remember, in nature a plant would actually be quite densely packed around lots of other plants, meaning that they wouldn't have a huge load of soil dedicated just to them.
Signs Your Plant Needs a Bigger Pot
Your houseplant may be ready for a larger pot if you notice any of the following:
- Roots growing out of the drainage holes.
- Water running straight through the pot.
- Soil drying out much faster than usual.
- Growth slowing during the growing season.
- Roots circling tightly around the inside of the pot.
Read more about this in our previous blog - "How Do I Know When My Houseplant Needs a Bigger Pot?".
Does Every Plant Need Frequent Repotting?
No.
Fast-growing plants such as Monsteras, Pothos and Peace Lilies may benefit from repotting every year or two.
Slower-growing plants like Snake Plants, ZZ Plants and many succulents can happily stay in the same pot for several years.
Always check the roots rather than relying on a timetable.
Nursery Pots vs Decorative Pots
Many indoor plants grow best in a plastic nursery pot placed inside a decorative outer pot.
This setup offers several advantages:
- Excellent drainage.
- Easier watering.
- Less chance of overwatering.
- Simple to lift out and inspect the roots.
- Easy to swap decorative pots whenever you fancy a new look.
It's the method used by most professional growers and plant shops.
Why Choose Plastic Nursery Pots?
Plastic nursery pots are lightweight, durable and designed to help houseplants thrive. They're easy to move, simple to clean and can be reused many times, making them a practical and economical choice for indoor gardeners.
Combined with the right pot size and a good-quality soil, they provide an ideal environment for healthy root growth.
Find the Right Pot Size at Tom's Plant Pots
At Tom's Plant Pots, we stock a wide range of high-quality plastic nursery pots, from small 6cm pots for cuttings right up to large 22.5cm pots for mature houseplants.
Whether you're repotting your very first houseplant or caring for a growing indoor jungle, you'll find the perfect pot size to keep your plants healthy and happy.
Final Thoughts
Choosing the right pot size doesn't have to be complicated.
As a general rule, increase the pot size gradually, make sure your plant has good drainage, and only repot when the roots genuinely need more space.
Your plant will reward you with healthier roots, stronger growth and many years of happy growing.