During a heatwave, your urban planter boxes need extra attention. Here's how to know if they're getting enough water. First, perform the simple finger test. Insert your finger about 2 inches into the soil. If it feels dry at that depth, it's time to water deeply. For a more precise check, consider using a moisture meter.
Watch your plants closely for key signs of stress. Wilting leaves during the hottest part of the day can be normal, but if plants are still wilted in the early morning or evening, they are severely thirsty. Other warning signs include leaves turning yellow or brown at the edges, becoming crispy, or dropping off. Stunted growth and dry, cracked soil that pulls away from the sides of the planter are also clear indicators.
To help your containers retain moisture, water early in the morning before the sun gets strong. This allows water to reach the roots with less evaporation. Applying a layer of mulch on top of the soil is highly effective for locking in moisture. Ensure your planter boxes have proper drainage holes to prevent root rot while still allowing for deep, thorough watering until you see water escaping from the bottom. By monitoring the soil and your plants' condition daily during extreme heat, you can ensure your urban garden stays hydrated and healthy.