Choosing a pot is one of those decisions that feels simple until you're standing in a garden centre, surrounded by glazed ceramic, terracotta, plastic and everything in between. The truth is that the container you pick will shape how often you water, how well your plants root, and whether your patio or windowsill looks deliberate rather than cluttered. Get it right at the start and everything afterwards becomes easier.

Match the Pot Size to the Plant, Not the Space

The most common mistake is buying a pot that looks proportionate to a young plant. A seedling in a small pot may look neat, but roots need room to spread, and cramped roots mean stunted growth, frequent drying out and a plant that never really thrives. As a rough guide, herbs and small salad leaves are happy in a 15–20cm pot, bush tomatoes and peppers want at least 30cm, and courgettes, aubergines or dwarf fruit trees need 40cm or more.

Bigger is generally better than smaller, with one important caveat: a very large pot filled with compost that no roots have reached will stay wet for weeks, which can rot the plant just as surely as drought. If you are potting up a small plant into a big container, either choose a smaller pot for now and repot later, or fill the base with a layer of grit or gravel to improve drainage.

• Small pots (under 20cm): herbs, lettuce, spring onions, alpines
• Medium pots (20–30cm): chillies, peppers, strawberries, most bedding plants
• Large pots (30–45cm): tomatoes, dwarf beans, blueberries, roses
• Very large pots (45cm+): courgettes, small fruit trees, Japanese maples

Drainage Holes Are Non-Negotiable

Waterlogged compost is the quiet killer of container plants. Whatever style of pot you fall for, check the base before you buy. If there is a single small hole, or none at all, walk away unless you are confident about drilling it yourself — and even then, ceramic and glazed pots can crack unpredictably.

Once planted, raise the pot slightly off the ground using pot feet, bricks or even old tiles. This stops the drainage hole sitting flush against a paving slab, where it will seal itself with mud and grit within a season. If a decorative pot has no holes and you love it anyway, use it as a cachepot and keep your plant in a plain nursery pot inside, lifting it out to water.

Material Matters More Than You Might Think

Every material behaves differently in a British climate, where a hot June afternoon can be followed by a fortnight of drizzle.

• Terracotta: Porous, so it breathes and wicks moisture away from the roots. Excellent for rosemary, lavender and other Mediterranean herbs that hate wet feet. The downside is that it dries out fast, so it suits a gardener who checks plants daily.
• Glazed ceramic: Heavier and less porous, so compost stays moist for longer. Good for thirsty plants like tomatoes, but frost can crack cheaper glazes, so empty and store them over winter if you can.
• Plastic: Light, cheap and excellent at holding moisture. Ideal for balconies with weight limits and for anyone who waters once a week rather than once a day. It does heat up quickly in full sun, so shade the pot or choose a light colour.
• Fabric grow bags: Brilliant for air-pruning roots and preventing the circling that plagues long-term container plants. They dry out quickly and look untidy, so they work best tucked behind something or in a gravel tray.
• Wooden planters: Attractive and insulating, keeping roots cooler in summer and warmer in winter. Line them with a plastic sheet with holes punched through, as bare wood rots surprisingly fast.

Think About Weight and Where the Pot Will Live

A 40cm terracotta pot filled with damp compost can weigh 30kg or more. That is fine on a patio, but on a balcony you need to consider the load-bearing limits, and on a windowsill it is simply not an option. Before you commit, decide where the pot is going and whether you will ever need to move it. If the answer is yes, choose plastic or fibreglass, or stand the pot on a wheeled saucer.

Indoors, weight matters less but light does. A pot on a north-facing windowsill will grow very different plants from one on a sunny south-facing sill, and dark pots absorb heat that can scorch roots pressed against the side. Pale colours and light materials are gentler on plants in strong sun.

Make Watering Easier Before You Plant

The best pot for your routine is the one that fits how often you are actually willing to water. If you are out at work all day, a large plastic or glazed pot with a built-in reservoir will serve you far better than a beautiful terracotta trough that needs attention every morning.

A few practical tricks help whatever you choose. Add a layer of gravel or broken crocks at the base to keep compost out of the drainage hole. Mix in water-retaining granules or well-rotted compost to buffer against dry spells. Top the surface with a mulch of gravel or bark to slow evaporation. And group pots together so they shade one another — a simple arrangement that can cut watering by a third in high summer.

Finally, remember that a pot is a small, enclosed world. It has no subsoil to draw on, so nutrients run out within weeks. Whatever container you choose, plan to feed regularly through the growing season and to refresh the top few centimetres of compost each spring. Choose well now and the pot will quietly do half the work for you.