Watering and drainage on a terrace
Grow more on your terrace.
Container soil on a terrace dries far faster than in-ground soil because wind and radiated heat draw moisture from the surface continuously. In high summer, large containers may need watering once or even twice a day without a drip system. Check moisture at the root zone, not just the surface: push a finger 5 cm into the mix, and water when it feels dry at that depth.
Drainage is the other half of the challenge. Terraces are waterproofed structures, and standing water damages the membrane beneath your containers. Every container needs drainage holes and should be raised slightly on feet or a saucer with gravel to let water escape rather than pool.
Self-watering containers with integrated reservoirs are the most practical solution for terrace growing. They buffer against drying out between waterings and let excess water drain below the root zone rather than sitting in it. A simple drip irrigation system on a timer eliminates most hand-watering labour and keeps yields consistent during holidays.