Why Herbs Suit British Balconies and Small Gardens

Few garden projects give as much back as a few pots of herbs. They take up barely any room, they cope with the wind and rain we inevitably get, and they earn their keep every time you cook. A sunny balcony, a windowsill, a doorstep, or the corner of a small patio is plenty. Even a north-facing garden can support mint and parsley if you are realistic about what will thrive there.

Most culinary herbs are Mediterranean plants by origin, which means they want two things above all else: sunshine and free-draining soil. Give them those and they are remarkably forgiving. Get the basics right and you will be cutting fresh basil for a tomato salad well into September, while a supermarket bunch quietly turns to slime in the fridge.

Choosing the Right Herbs for Your Space

Sunlight is the deciding factor. Before you buy anything, watch your growing spot for a day and note roughly how many hours of direct sun it receives. That single observation will save you a lot of disappointment.

• Six or more hours of sun: basil, thyme, rosemary, oregano, sage and lavender. These are your sun-lovers and will sulk in shade.
• Three to six hours: parsley, chives, mint and coriander. They will manage, though flavour is always best with more light.
• Two to three hours: mint, chives and parsley will cope. Treat anything else as a bonus rather than a plan.

Think about your microclimate too. A balcony against a south-facing brick wall can be noticeably warmer than the garden below, which is a genuine advantage for basil. Conversely, a windy balcony will dry pots out fast and snap tall stems, so a low pot with bushy plants beats a leggy specimen every time.

If space is genuinely tight, grow fewer herbs but grow them well. Three healthy pots will out-produce nine struggling ones, and you will enjoy them far more.

Pots, Compost and Drainage

Drainage is where most container herbs fail. A pot without holes in the base becomes a swamp after a downpour, and herb roots rot quickly in soggy compost. Whatever you plant in, make sure water can escape freely.

• Size matters: aim for pots at least 20–25cm across for individual herbs, and 30cm or more for a mixed planting. Bigger pots hold moisture more evenly and are less likely to blow over.
• Material: terracotta looks lovely and dries out faster, which suits thyme and rosemary. Glazed or plastic pots hold moisture better, which is kinder to mint and parsley.
• Compost: use a peat-free multi-purpose compost with a handful of horticultural grit or perlite mixed through for extra drainage. A layer of crocks in the bottom is traditional but a decent potting mix matters more.
• Feeding: start with compost that contains slow-release feed, then top up with a liquid tomato feed every fortnight during the growing season.

Raise pots onto feet or small blocks so water drains away rather than pooling underneath. This also helps air circulate and reduces slug traffic.

Watering Through Warm Spells

In July and August, a small pot in full sun can dry out in a single day. Watering is the one job you cannot skip. Check the compost with your finger before you water; if the top couple of centimetres are dry, it is time.

• Water in the morning where possible, so plants are hydrated before the heat of the day.
• Water thoroughly until it runs from the base, rather than giving a light sprinkle. Shallow watering encourages weak roots near the surface.
• Never let pots stand in a saucer of water for long, especially basil and rosemary.
• Group pots together during hot weather to shade one another and slow evaporation.
• If you are away, move pots into shade and stand them in a shallow tray of water, or ask a neighbour. Herbs are far more forgiving of a missed feed than a missed drink.

Mint is the exception to almost every rule here. It likes moisture and will happily sit in slightly damper compost, which is why it is best kept in its own pot. Left to its own devices, mint will romp through a mixed container and smother everything beside it.

Harvesting, Pruning and Keeping Them Going

Regular picking is what keeps herbs bushy rather than woody. The more you cut, the more the plant branches and the more leaves you get.

Pinch out the growing tips of basil every week or so, always cutting just above a pair of leaves. Remove any flower buds as soon as they appear, because once basil flowers the leaves turn bitter and production slows. Thyme, oregano and sage respond well to having the top third trimmed after flowering, which keeps them compact and stops them going leggy. Chives can be cut hard back to about 5cm and will regrow within a fortnight.

Never take more than a third of the plant at once. Rosemary in particular dislikes being cut back into old, bare wood, so keep trimming the soft new growth and it will stay productive for years.

Come autumn, tender herbs such as basil will fade with the first cold nights. Bring a pot indoors onto a bright windowsill to extend the season by a few weeks. Hardy types like thyme, sage and rosemary will overwinter outside quite happily in most of the UK, provided the pot drains freely and you do not water too generously through winter. A little protection from the worst of the wet, such as raising the pot onto feet, makes a real difference.

Sow a fresh batch of basil in late spring and again in midsummer for a continuous supply, and you will find that a modest corner of a small garden or balcony quietly becomes the most useful patch you have.