What size pot do balcony plants need in the UAE?

Pot size is a heat decision in this climate, not just a root-space one. Substrate volume buffers temperature: a large pot warms slowly and holds moisture through the afternoon, while a small one reaches the air temperature of a 45°C balcony and stays there. Roots are damaged well below the point at which foliage shows it, so the plant looks fine until it suddenly does not.

Colour and material compound it. A black plastic nursery pot in direct sun runs far hotter than a pale ceramic or fibre pot of the same size, and thin walls conduct that heat straight to the root ball. If you keep a plant in the nursery pot it arrived in, at least slip it inside a larger outer pot — the air gap alone helps.

Three more things that matter specifically on a balcony. Raise every pot off the tile, because the floor is often the hottest surface you own. Group pots together so they shade each other's sides. And use a saucer, both to hold a reserve and because most Dubai buildings prohibit water draining onto the balcony below.

Sizing by plant: annual trays and herbs are fine in 20-25cm because they are seasonal; flowering shrubs, citrus and grasses want 30-40cm; a dwarf date palm or a standard tree needs 45cm and up. When you are between sizes here, go up — the larger pot is the more forgiving one every time.