Why balconies catch more wind than you might expect

If your balcony sits above the second floor, it is effectively a small piece of rooftop. Wind that would barely register at ground level accelerates as it squeezes between buildings, then drops or curls around corners, so a gust can arrive from an unexpected direction. Add the funnel effect of a recessed balcony and you have a space where a gentle breeze becomes a plant-toppling squall two or three times a season.

Wind harms plants in two ways. The obvious one is physical: stems snap, flowers shred, leaves tear and light pots tip over the railing edge. The subtler damage is drying. Moving air strips moisture from leaves faster than roots can replace it, so even well-watered pots wilt, and gritty compost dries out within a day. On exposed coastal balconies, salt carried on the wind adds another layer of stress, scorching leaf edges on tender plants.

The good news is that a balcony can be made genuinely sheltered with a few simple measures. You do not need to seal it up or turn it into a greenhouse. You just need to slow the wind down, keep pots anchored, and pick plants that shrug off the weather.

Secure every pot before the first gale

A pot that moves is a pot that abrades roots, topples neighbouring plants and may end up on the pavement below. Weight and stability matter more than neatness, so build your scheme around wide, low containers rather than tall, narrow ones.

• Ballast the base. Put a layer of gravel or broken crocks in the bottom of light plastic pots before adding compost. For very exposed spots, a few clean bricks or paving slabs in the base of a large planter add real security.
• Group pots together. Clustered containers shelter one another and present less individual surface area to the wind. Leave small gaps so air still moves and slugs do not gather.
• Fix what you can to the railing. Bungee cords, cable ties or adjustable straps around the rim of a planter and the balcony rail will hold it in place without drilling. Check your tenancy agreement before fixing anything permanently, and never underestimate the weight of filled pots on a railing designed only as a barrier.
• Use pot feet and saucers thoughtfully. Feet aid drainage and stop water staining the balcony floor, but a deep saucer catching rain can make a light pot top-heavy. Empty saucers after heavy rain.
• Check ties after every storm. Plastic cable ties become brittle in UV light. Replace them each spring, and inspect any brackets you have fitted.

Terracotta is heavy and stable, though it can crack in a hard frost, while glazed and plastic pots are lighter and need more ballast. Whatever you choose, avoid stacking pots on stands in an exposed position. One gust and the whole arrangement goes over.

Choose plants that bend rather than break

On a windy balcony, flexible is better than rigid. Grasses are the obvious heroes here, and they look wonderful moving in a breeze rather than being damaged by it.

• Small to mid-sized grasses: blue fescue, pheasant grass, bronze carex and hakonechloa all cope well with exposed conditions and stay tidy in containers.
• Tough shrubs: lavender, rosemary, hebe and small euonymus varieties have dense, wind-resistant foliage and suit a sunny, sheltered corner.
• Low-growing stalwarts: sedum, thrift, thyme and small alpine plants hug the compost and rarely suffer in a gust.
• Avoid the fragile crowd: tall, large-leaved plants such as courgettes, cucumbers, dahlias and top-heavy tomatoes will need constant staking, and even then often lose the battle.

If you do want height, use a shrub with a sturdy stem rather than a leggy annual, and plant it in the most sheltered corner of the balcony rather than in the middle of the railing. Wind-tunnel corners are usually at the outer edges, while the wall side of a recessed balcony is calmer and warmer.

Build a windbreak that filters, not blocks

A solid panel along the railing seems like the obvious answer, but it creates turbulence on both sides and can place real strain on the structure in high winds. A permeable screen, with roughly half the surface open, is far more effective: it slows the wind rather than deflecting it into destructive eddies.

Slatted trellis, willow hurdles, hazel panels and woven reed screens all work well. Aim for something around one to one and a half metres high above the railing line, positioned on the side the prevailing wind arrives from — usually south-west in most of the UK, though a coastal balcony may face something more northerly or easterly.

Renters can use freestanding trellis panels with weighted feet, or lightweight trellis zip-tied to the railing and removed at the end of the tenancy. Check first that nothing blocks a fire escape route or an emergency exit. Where sunlight is limited, use a low screen or open slats: even a 50 per cent permeable barrier takes the sting out of the wind while letting most light through. A screen that shelters one side may also create a bright, warm pocket for sun-loving herbs, so watch how shadows move across the balcony through the day before committing.

A simple windy-weather routine

Once your pots are anchored and your screen is up, the main job is maintenance, especially through autumn and winter.

• Water in the morning rather than the evening, and check pots after any windy day, even if it has rained — wind dries compost surprisingly fast.
• Top-dress pots with a layer of gravel or bark mulch to reduce evaporation and stop light compost blowing away.
• After a gale, walk the balcony and check ties, stems, saucers and compost levels. Firm any plants that have been rocked loose and cut back snapped stems cleanly.
• Move the most delicate pots to the wall side of the balcony for winter and rotate them back out in spring.

A windy balcony is never going to feel like a walled garden, but with heavy pots, flexible planting and a decent filter screen, it can be a genuinely comfortable place to sit — and a surprisingly good home for grasses, herbs and tough little shrubs.