It's a common dilemma for city gardeners: are you giving your planter box plants too much love in the form of water? Overwatering is one of the most frequent causes of plant decline in urban settings. Here’s how to know for sure.
First, check the soil before you water. Don't just water on a schedule. Push your finger about an inch into the soil. If it feels moist or wet, hold off on watering. Your plants need oxygen as much as they need water, and soggy soil suffocates the roots.
Next, look for visual clues on the plant itself. Yellowing leaves, particularly on the lower part of the plant, are a classic sign. Surprisingly, wilting can also indicate overwatering, as damaged roots can't take up water effectively. If the leaves feel soft and mushy instead of crisp, it's a strong indicator of too much moisture.
Be aware of pests and mold. Consistently wet soil creates a perfect environment for fungus gnats, which are small flies hovering around the soil. You might also see a white, fuzzy mold growing on the soil surface. These are clear signals that the environment is too damp.
Finally, inspect the roots if you suspect a serious problem. Gently remove the plant from its box. Healthy roots are firm and white or light tan. Overwatered roots will be dark brown or black, feel slimy, and have a musty, unpleasant odor. This is root rot, a serious condition caused by excess water.
The key to success is deep, infrequent watering that allows the top layer of soil to dry out between sessions. This encourages strong, deep root growth and keeps your urban garden thriving.