For a typical urban planter box about 60 × 30 × 35 cm (24 × 12 × 14 in), holding roughly 15–20 gallons of soil, plan on 10–20 liters (2.5–5 gallons) of water per week in hot summer weather. In extreme heat (30–35°C/86–95°F), full sun, and fast-growing annuals or vegetables, it may need closer to 20–30 L (5–8 gallons), while shade-tolerant or succulent plants may need only 5–10 L (1.3–2.6 gallons). Rather than following a rigid schedule, check the soil every day or two: water when the top 2–3 cm (1 in) feels dry. Water deeply in the morning until it drains from the bottom, then empty saucers so roots do not sit in water. Mulch the surface, group pots for shade, and use drip irrigation or self-watering inserts to reduce evaporation. Small boxes dry out faster and may need daily watering; large boxes can often go two or three days between waterings. The best rule is to measure by feel and plant response, not by a fixed number alone.
How much water does a typical urban planter box need during a hot summer week?
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