Why Herbs Are Made for Balconies

Few plants earn their place on a balcony as readily as culinary herbs. They are compact, generous, and happy in a pot — and because you pick a few leaves at a time rather than waiting for a single harvest, even a modest windowsill can supply you from spring right through to autumn. The trick is choosing the right herbs for the light and shelter your balcony actually offers, and giving them a compost and watering routine that suits a container rather than a garden border.

This guide covers the three easiest herbs to start with — basil, mint and thyme — plus the principles that apply to almost anything else you fancy trying.

Find Your Best Spot First

Before you buy a single pot, spend a day watching your balcony. Note where the sun falls and when, and where the wind hits hardest. Balconies are exposed places: a third-floor ledge can funnel wind like a tunnel, drying compost and snapping soft stems.

• South or west-facing: the ideal spot for basil, thyme, rosemary, oregano and sage. Aim for six hours of direct sun in summer.
• East-facing: good morning light and gentler heat — fine for mint, parsley, chives and coriander.
• North-facing: stick to mint, parsley and chives, and accept that basil will sulk.
• Wind: a glazed balustrade, a trellis with a climbing plant, or simply grouping pots together will shelter them. Grouping also creates a microclimate and slows water loss.

Remember that masonry and paving radiate heat overnight, so a city balcony can be a degree or two warmer than the surrounding streets — a small advantage in a cold spring.

The Three Best Herbs to Start With

Basil is the star of a sunny balcony, but it is also the fussiest. It hates cold: anything below about 10°C will check its growth, so do not put it outside until the risk of frost has passed — usually mid-to-late May in most of the UK, later in the north. Buy a supermarket pot, split the crowded seedlings into three or four pots, and pinch out the growing tips regularly to keep it bushy. Once it flowers, the leaves turn bitter, so keep picking.

Mint is the opposite: tough, fast-growing and almost impossible to kill. It spreads by underground runners, so give it its own pot and never plant it alongside anything else. Spearmint is best for cooking; Moroccan mint makes excellent tea. Cut stems hard rather than snipping individual leaves — it will bounce back within a fortnight.

Thyme is the balcony herb that looks after itself. It is a Mediterranean plant that wants sharp drainage and plenty of sun, and it actively resents being fussed over. A terracotta pot, gritty compost and occasional watering suit it far better than rich soil and daily attention. Common thyme and lemon thyme are both excellent, and both stay neatly compact.

If you have room for more, add rosemary (a tall pot, plenty of sun), chives (happy in shade), sage and oregano.

Pots, Compost and Drainage

Container growing lives or dies by drainage. Whatever you choose, it must have holes in the base, and it must never sit in a puddle.

• Size: go bigger than you think. A 20–30cm pot suits basil and thyme; mint will happily take a 30cm pot or larger.
• Material: terracotta breathes and dries out faster, which suits thyme and rosemary. Glazed or plastic pots hold moisture longer, which mint and basil prefer.
• Compost: a peat-free multipurpose compost works for most herbs. For thyme, rosemary and oregano, mix in 30 per cent horticultural grit by volume.
• Drainage: crocks or a few stones in the base, and raise pots on feet or tiles so water can escape. A saucer is fine in summer, but empty it after rain.

Planting, Watering and Feeding

Plant into damp compost, firm gently around the roots and water in well. From then on, the golden rule of containers is little and often. Balcony pots dry out far faster than garden soil — on a hot, breezy day a small pot may need water twice. Push a finger in to the second knuckle; if it is dry, water until it runs out of the base.

Feeding matters more in pots because nutrients wash out with every watering. Start feeding about six weeks after planting.

• Leafy herbs — basil, mint, parsley, chives — appreciate a balanced liquid feed every fortnight.
• Woody Mediterranean herbs — thyme, rosemary, sage — need very little. A weak feed once a month is plenty; too much produces leafy growth with poor flavour.
• Basil and mint in particular respond well to a tomato feed once they are growing strongly.

Harvesting Well and Keeping Them Going

Regular picking is what keeps a herb productive — it signals to the plant to keep making new growth rather than setting seed and stopping. Take no more than a third of the plant at any one time, and always cut above a pair of leaves so new shoots form below the cut.

Pinch out basil flowers the moment you see them. Strip mint from the top down. Snip thyme sprigs rather than pulling at the stems, which can uproot the whole plant.

As autumn arrives, bring basil indoors to a bright windowsill before the first cold nights, and it will often carry on for weeks. Mint dies back naturally and returns in spring. Thyme, rosemary and sage are hardy enough to stay outside, but move their pots against a sheltered wall and ease off the watering — soggy winter compost, not cold, is what usually kills them.

Start with three pots on a sunny ledge and you will have more than enough for salads, stuffings and evening drinks by midsummer — and a balcony that smells wonderful every time you step outside.