Choosing the Best Pots for Balcony Vegetable Growing

By Succession Sowing for a Continuous Supply of Vegetables
Comments 35
2 Sep 2026

Choosing the Best Pots for Balcony Vegetable Growing

Why the Container Matters More Than You Think

On a balcony or a compact allotment plot, your pot has to do the work of soil, subsoil and drainage ditch all at once. Three things decide whether it does that job well: how much it weighs when wet, how freely it drains, and how quickly it heats up and cools down. Nail those three and your tomatoes, chillies and salad leaves will cope with most of what a British summer can throw at them.

Weight is the one people forget. A 10-litre pot filled with moist multipurpose compost weighs roughly 8–10kg, and a row of five along a balcony edge can easily add 50kg to a small area. Many balconies are quoted at somewhere between 150 and 300kg per square metre, but that figure assumes even distribution, so spread pots out rather than clustering them in one corner. If you rent, check your lease before building a jungle of wet compost.

Plastic Pots: Light, Cheap and Adaptable

Plastic is the sensible default for most balcony growers. It is light enough to move when you need to rearrange, cheap enough to experiment with, and available in every shape from shallow herb troughs to tall tomato planters. Because the walls are non-porous, water stays in the compost rather than evaporating through the sides, which suits thirsty crops in a windy spot.

The drawbacks are worth knowing. Dark plastic absorbs heat, and a black pot against a south-facing wall in July can push compost temperatures high enough to stress roots and bake off moisture. Choose pale colours, or wrap the sunny side in an old towel or a strip of hessian. Thin plastic also goes brittle after a season or two of ultraviolet light; pots with walls of 3mm or more will last years. Check the drainage holes before planting — many decorative pots have just one, or none at all. Five or six holes of 10mm across are far better than a single central one, and you do not need a layer of crocks at the bottom.

Terracotta: Stable, Breathable, Heavy

Terracotta is porous, so air and water move gently through the walls. That helps roots breathe and buffers temperature swings, keeping the root zone cooler in hot spells — ideal for lettuce, herbs and strawberries that sulk when they cook. The same porosity means constant water loss. On an exposed balcony in a dry August you may find yourself watering twice a day.

The bigger consideration is weight. A 30cm unglazed terracotta pot can weigh 6–10kg empty, before you add compost. Unglazed pots can also crack in a hard frost, so empty them or move them under cover over winter. Glazed pots hold moisture much better but lose the breathability that makes terracotta special. Use terracotta for permanent plantings — rosemary, thyme, mint in its own pot, or blueberries in ericaceous compost — where you are not constantly hauling it about.

Fabric Pots: Air-Pruned Roots, Fast Drainage

Fabric or felt pots are light, fold flat for storage and give a lot of volume for the money. When roots reach the wall they meet air and stop growing, which encourages a dense, fibrous root ball instead of the circling tangle you get in smooth plastic. Drainage is excellent, so waterlogging is almost impossible, even in a wet spell.

The trade-off is speed of drying and poor insulation. Compost temperatures swing with the weather, and wind strips moisture from the fabric surface. Pale fabric is better than black, which gets alarmingly warm in full sun. Stand fabric pots in a shallow tray, sit them on capillary matting, or pair them with a self-watering base for greedy crops. Expect three to five good seasons before the seams start to go. They suit potatoes, courgettes and tomatoes particularly well.

Matching Pots to Crops and Conditions

Tomatoes: 20–30 litres per plant; pale plastic or a self-watering planter.
Chillies and peppers: 5–10 litres; terracotta works nicely.
Salad leaves and soft herbs: 3–5 litres, shallow is fine; terracotta keeps them cool.
Dwarf French beans: 10 litres for three or four plants.
Courgettes: 30–40 litres; fabric pots are excellent.
Strawberries: about 5 litres per plant; terracotta or a tiered planter.

Wind matters as much as sun. A tall, light pot on a gusty balcony will topple and take your crop with it, so choose a heavier container, weight the base with a brick, or tie stems to the railing. Grouping pots together creates a slightly warmer, more humid microclimate and gives shade to the sides of neighbouring containers.

Small Habits That Keep Crops Healthy

Lift every pot onto feet, bricks or battens so drainage holes never sit in a puddle. Saucers are useful in dry spells, but empty them after heavy rain so roots are not left standing in water. A 2cm mulch of gravel or rough compost on the surface cuts evaporation noticeably and keeps compost off your leaves when you water.

Water in the morning where you can, aiming at the compost rather than the foliage, and check pots daily in July and August — fabric and terracotta pots especially. Rotate pots a quarter turn each week so all sides get light, and remember that a plant in a small pot needs feeding more often than one in the ground, usually a liquid tomato feed every week or two from midsummer. Pick the container to suit the crop and the spot, and the rest becomes far easier.

Containers

Growing Climbing Beans in a Small UK Garden

Learn about pot size, support, watering and feeding for compact tomato varieties that crop well in sunny, sheltered spots against a warm wall.

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5 Comments

Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply
- John Abraham says Jul 21, 2024 at 10:00am
  
  I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
  Reply
  - Robert Sonnysays Jul 21, 2024 at 10:00am
    
    I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
    Reply
Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply

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