The balcony garden thing has moved well past the pandemic novelty stage. People in London, Berlin, Barcelona and everywhere else with overpriced flats and no outdoor space have worked out that a two-square-metre balcony can produce food worth eating, not just a decorative pot of sad basil that dies before August.
The reality check first: full sun for at least five to six hours a day is non-negotiable if you want anything beyond salad leaves. East-facing balconies get morning light and are mostly useless for fruiting plants. West-facing is workable. South-facing is the jackpot. If you are renting, check what your lease says about structural load before bolting anything heavy to the railings.
What works in two square metres is a vertical setup. A freestanding shelving unit from somewhere like Ikea or a decent garden centre, running three or four tiers, multiplies your growing surface without touching your floor space. Fill it with deep troughs rather than individual pots. Courgettes need at least 30 litres of compost each and will absolutely take over, so one plant per trough, maximum. Tomatoes in a grow-bag or a 20-litre pot, trained up a cane tied to the balcony railing, will give you fruit from July through to October if you water consistently. Cherry varieties like Tumbling Tom or Gardener’s Delight are more reliable than beefsteak in a container. Climbing French beans up a frame, salad leaves in shallower troughs on the upper shelves, herbs at eye level where you will actually remember to use them.
I spent most of last summer eating tomatoes off my own Hackney balcony that cost roughly 60p per plant to grow. The smug satisfaction was out of all proportion to the achievement.
The kit spend is real but one-off. A decent tiered shelving frame runs £40 to £80. Troughs, around £5 to £15 each depending on size. A bag of good peat-free compost, £8 to £12. Seeds cost almost nothing, £1.50 to £3 per packet, and most packets give you far more than a small space can use. Split packets with a friend or neighbour. Watering is the main ongoing commitment. Containers dry out fast in summer, sometimes twice a day in a heatwave, and a single missed watering can finish off a tomato plant that took ten weeks to get established. A basic drip-irrigation kit connected to a tap and a cheap timer, around £25 to £40, takes the stress out of it entirely if you travel.
Take weight seriously. Wet compost is heavy. A 30-litre trough fully watered can hit 35 to 40 kilograms. Check your balcony’s load rating if you are stacking multiple containers, particularly on newer build flats where balconies are sometimes rated lower than you would expect. Spread the weight across the floor rather than concentrating it near the outer edge. The same caution applies to anything mounted on or over the railing. A pot blown off a third-floor balcony is a genuine hazard to whoever is underneath, so keep railing planters clipped or bolted on the inside face, secure canes and frames properly, and bring lightweight pots in if high winds are forecast.
The payoff beyond the actual food is that a productive balcony looks considerably better than an empty one, takes maybe fifteen minutes a day at peak season, and gives you something wholesome to do that is not staring at a screen. Whether that justifies the initial faff is a personal call, but most people who try it do it again the following year.
