Watering plants in urban planter boxes isn't about sticking to a rigid schedule. The frequency depends on several key factors that can change daily. First, consider your plant type. Succulents and drought-tolerant herbs like rosemary need less water, while leafy vegetables and flowering annuals typically require more consistent moisture.
Season plays a crucial role. During hot summer months, you might need to water daily, especially for smaller containers. In spring and fall, this might drop to every 2-3 days. In winter, watering might only be necessary once every couple of weeks for dormant plants.
Container size and material matter greatly. Small, porous terracotta pots dry out much faster than large, plastic or glazed ceramic planters. Always check the soil before watering—stick your finger about an inch deep. If it feels dry, it's time to water. If it's moist, wait another day.
The best approach is to water deeply until it runs out the drainage holes, then allow the soil to partially dry out before the next watering. This encourages strong root growth and prevents the common urban gardening mistake of overwatering, which is more often fatal to plants than underwatering. Observe your plants regularly; drooping leaves or dry, crispy edges are clear signs you need to adjust your routine.