Balcony gardening means growing plants on a balcony — often the only outdoor space a flat or apartment has. A balcony garden can be surprisingly productive: herbs, salads, tomatoes, strawberries and flowers all grow well in pots, and a well-planted balcony is a pleasant place to sit, a haven for bees, and a source of fresh food a few steps from the kitchen.
Balconies have their own rules. They are windy, they can be very hot or very shady, pots dry out fast, and weight matters — a balcony is built to hold people and furniture, not tonnes of wet soil. The key is to choose light containers and soil, pick plants that suit the sun and wind you actually have, and water regularly. Before you load up a balcony, check your building rules and your lease: some buildings restrict what you can put on a balcony, how much weight it can hold, and whether you can fix things to railings. If you are unsure about weight limits, ask your building manager or landlord first, and check your local extension service for plant advice suited to your area.
Weight, rules and safety first
Weight is the first thing to think about, because wet soil is heavy. A large pot full of wet compost can weigh a great deal, and a balcony full of them can exceed what the structure was designed for. Use lightweight containers — plastic, fibreglass or fabric grow bags rather than stone or concrete — and use a light, peat-free compost rather than heavy garden soil. Do not fill a balcony with large pots of wet soil, and do not put heavy features such as a water butt or a stone trough on a balcony without checking the load limit. Check your lease and building rules too: some buildings ban fixing planters to railings, ban anything that overhangs the edge, or ban watering that drips onto neighbours below. Fix everything securely so pots cannot fall, use saucers to catch drips, and never place anything on the outside of the railing. Safety comes before gardening, and a quick check with your building manager now saves trouble later.
Sun, shade and wind on a balcony
Every balcony has its own microclimate, and it decides what will grow. A south-facing balcony is hot and sunny — ideal for tomatoes, peppers, herbs and Mediterranean plants, but pots dry out fast and leaves can scorch. A north-facing balcony is shady and cool — good for lettuce, spinach, herbs such as mint and parsley, ferns and shade flowers, but not for tomatoes. An east-facing balcony gets gentle morning sun, and a west-facing one gets strong afternoon sun. Wind is the other factor: balconies, especially high ones, are windy, and wind dries pots, breaks stems and chills plants. Use the railing or a trellis with a windbreak fabric to slow the wind, choose sturdy, compact plants rather than tall, floppy ones, and group pots together so they shelter each other. Watch your balcony through a day before you buy plants, and note sun hours honestly — a balcony that feels bright may get only a few hours of direct sun.
Containers, soil and watering
Choose containers with drainage holes, because plants in pots without drainage will rot. Use the largest pots you can manage within the weight limit — large pots dry out more slowly than small ones — and use a good peat-free compost, mixed with a little perlite or grit for drainage. Self-watering pots are worth considering for a balcony, because they keep plants watered for days and reduce the risk of drying out. Water in the morning, check pots daily in summer, and water until it runs from the drainage holes — but use saucers so water does not drip onto neighbours. In hot, windy weather, pots may need watering twice a day. Mulch the surface of large pots with bark or gravel to slow evaporation. Feed container plants regularly, because nutrients wash out of pots quickly: a liquid feed every one or two weeks in the growing season suits most vegetables and flowers. Our container gardening guide covers the basics, and the watering calculator helps estimate needs.
Best plants for a balcony
On a sunny balcony, grow tomatoes — choose a compact or bush variety — peppers, chillies, courgettes in a large pot, herbs such as basil, rosemary, thyme and sage, and salads that you can pick a little at a time. See growing tomatoes, growing basil and growing rosemary. Strawberries do well in hanging baskets and troughs, and they trail prettily over the edge. On a shady balcony, grow lettuce, spinach, chard, mint, parsley, chives and shade-tolerant flowers such as fuchsias, begonias and ferns. For colour, try geraniums, petunias, nasturtiums and trailing lobelia, which all cope with pots and flower for months. Grow climbers such as sweet peas or nasturtiums up a trellis for privacy and scent, and use railing planters for herbs so they are within reach of the kitchen. Choose compact varieties bred for containers, and do not overcrowd — a few plants grown well beat many plants grown badly.
Making a balcony garden look good
A balcony garden looks best when it is planned, not just filled. Use pots in a few matching colours and materials rather than a jumble, and vary heights — tall plants at the back, medium in the middle, trailing plants at the front — so the display has depth. Use a trellis or a small obelisk for climbers, and a shelf or a plant stand to use vertical space. Add a small seat and a table if there is room, because a balcony garden is for sitting in as well as growing in. Keep the floor clear enough to walk on, and leave access to the door. Tidy regularly: remove dead leaves, deadhead flowers, and replace plants that have finished. A balcony garden is close to the house, so you will see it every day — a little regular care keeps it looking good, and a neglected balcony is obvious from inside. Keep it simple, keep it tidy, and grow what you will use.
Year-round balcony gardening
A balcony garden can work all year. In spring, sow salads and herbs, and plant out tomatoes and peppers after the last frost. In summer, enjoy the harvest and keep watering. In autumn, sow winter salads such as lamb's lettuce and winter purslane, plant spring bulbs in pots, and bring tender herbs such as basil indoors before the first frost. In winter, hardy herbs such as rosemary, thyme and sage will carry on, and evergreen shrubs in large pots give structure. Protect pots from frost by moving them against the wall, wrapping them in hessian or bubble wrap, and raising them off the floor on feet so they do not sit in water. Do not let pots freeze solid for long, because the roots will die. A balcony garden that changes with the seasons is more interesting than one that is planted once and left, and it gives you something to pick or look at in every month.
Common mistakes to avoid
The biggest mistake is overloading a balcony with heavy pots of wet soil without checking weight limits or building rules. The second is using pots without drainage holes, so plants sit in water and rot. The third is choosing plants for the sun you wish you had, rather than the sun you actually have — tomatoes on a north-facing balcony will never thrive. The fourth is under-watering: balcony pots dry out far faster than garden beds, especially in wind, and a missed day in summer can kill a plant. The fifth is fixing planters to railings in a way that is insecure or against the rules, risking a fall. The sixth is letting water drip onto neighbours below, which causes complaints. Finally, do not overcrowd a small balcony — leave room to sit and to reach your plants, and remember that a balcony garden is a small space, so grow a few things well rather than many things badly. If you are unsure about weight or rules, ask your building manager, and check your local extension service for plant choices.
Frequently asked questions
How much weight can a balcony hold?
It varies by building, age and design, so there is no safe general figure. Check your lease, ask your building manager, and use lightweight pots and compost. As a rule, spread weight evenly, avoid very large heavy pots, and never put a water butt or stone feature on a balcony without checking first.
What grows best on a shady balcony?
Leafy crops and shade lovers: lettuce, spinach, chard, mint, parsley, chives, ferns, fuchsias and begonias. Avoid tomatoes, peppers and other sun-loving crops on a shady balcony — they need at least six hours of direct sun to fruit well.
How often should I water balcony plants?
Check daily in summer, and water when the top few centimetres of compost feel dry. In hot, windy weather, pots may need watering twice a day. Water in the morning, use saucers to catch drips, and consider self-watering pots if you are away often.
Can I grow tomatoes on a balcony?
Yes, on a sunny balcony. Choose a compact or bush variety, use a large pot, stake it well against wind, water daily in summer and feed weekly. Cherry tomatoes are often the most reliable balcony crop, because they ripen quickly and crop heavily from a single plant.
Do I need permission to garden on my balcony?
Often yes, or at least it is wise to check. Leases and building rules may restrict fixings to railings, overhanging planters, weight, and watering that drips below. Check your lease and ask your building manager before you start, and be a considerate neighbour about drips and fallen leaves.