Gardening on the 20th floor: wind, weight and society rules for high-rise balconies

Half of Gurugram now lives above the tenth floor, and most of the balcony gardens up there are planted as if they were on the ground. They last until the first March storm. A high-rise balcony is a different environment: it is windier, drier, hotter in the afternoon and under more scrutiny from the society. The good news is that the fixes are simple, and once you know them a 25th-floor balcony at DLF The Crest can be as green as a ground-floor one at Nirvana.

Wind: the thing nobody plans for

Wind speed rises with height and nothing breaks it above the surrounding rooftops. On an upper floor it dries soil in hours, shreds thin leaves, tips tall pots and, in the pre-monsoon storms, lifts anything light clean off the balcony. Four things fix it.

• Low, heavy planters. Wide base, short height, filled with a mix that holds water. A 50 cm trough does not tip; a 60 cm urn on a stand does.
• Plants that bend. Ornamental grasses, bamboo, bougainvillea, snake plant, succulents and thick-leaved foliage flex in the wind. Ferns, money plant and areca palm shred.
• Grouping. Six planters in a tight cluster shelter each other and lose far less water than six spread along the railing. Put the toughest plants on the windward end.
• Self-watering planters and drip. The wind dries the top inch of soil by noon. A reservoir or a drip line on a timer keeps the roots wet without you watering twice a day.

And one thing to stop doing: hanging planters outside the railing. On an upper floor they are a hazard to everyone below, and most societies ban them for exactly that reason.

Weight: what a balcony actually takes

A balcony is designed for people, furniture and a party, which is a lot more than a garden, as long as the load is spread. The problem is concentration: a row of wet ceramic pots in one corner, or a raised bed with a foot of soil. A 24-inch planter weighs 60–80 kg when wet; ten of them in one spot is most of a small car.

• Use fibre or polymer planters with a light, free-draining mix. They weigh a third of ceramic and do not crack in summer.
• Spread planters along the wall line, where the slab is strongest, not in the middle of the floor and not all in one corner.
• Raise them on feet so water drains and the slab is not sitting wet for weeks.
• Skip soil beds and lawns on a balcony entirely. If you want a lawn, you want a terrace, and a structural check first.

Society rules: what RWAs actually object to

We have not seen a published balcony rulebook for any Gurugram society, but we have talked to enough RWAs to know what triggers a notice. It is almost never the plants.

1. Anything hanging outside the railing. Planters, nets, shade cloth. Societies have had plaster and pots fall from balconies and they are rightly nervous about overhangs.
2. Drilling into the structure. Pergola posts, hooks, brackets. It changes the facade and can crack waterproofing.
3. Water on the balcony below. The single most common complaint. Trays under every planter, and drip lines inside the planters, end it.
4. Facade changes. A green shade net across the whole balcony has earned residents notices in more than one Gurugram society. A bamboo screen inside the railing, at railing height, rarely does.

Ask before you build, and put it in writing. At Good Theory the designer checks your tower's rules before the visit and you get a one-page note of exactly what is being installed: no drilling, nothing outside the railing, trays under everything. Most RWAs are satisfied with that.

Plants for the upper floors

Whatever direction your balcony faces, go one notch tougher than the ground-floor list. Bougainvillea, adenium, portulaca and vinca for flowers; grasses, bamboo, yucca, snake plant, aloe, agave and jade for structure; lemongrass, chillies and rosemary for the kitchen. Keep the broad-leaved plants against the back wall where the building shelters them, and read the by-direction guide for the rest.