Your Balcony Planter’s Drip Tray Might Be Holding Too Much Water
Food Systems
A tray under a pot protects the balcony floor, but retained water can leave the growing medium saturated. University of Minnesota Extension advises emptying water-catching trays so container plants don’t stay waterlogged.
Check the pot and soil before reaching for the watering can. Sun, wind, container size and plant growth affect how quickly moisture is used. Recheck during hot spells rather than relying entirely on a fixed schedule.
Keep the container’s drainage openings clear. If you’re growing herbs or vegetables, follow guidance for the specific plants and your local climate. A balcony sheltered from rain may behave very differently from an exposed garden pot.
Source
University of Minnesota Extension: Watering Container Plants