Watering is fundamental, but the "how often" depends greatly on whether your plants are in a planter box or in the ground. The core difference lies in root space and soil volume. Plants in the ground have extensive access to soil moisture and a larger reservoir to draw from. Planter boxes, however, have limited soil that dries out much faster due to exposure on all sides, leading to more frequent evaporation.
For in-ground plants, deep, infrequent watering is often best, encouraging deep root growth. You might water once or twice a week, depending on weather and soil type. Always check the soil a few inches down; if it's dry, it's time to water.
Planter boxes require a more attentive approach. They typically need watering more frequently—sometimes daily in hot, dry, or windy weather. The key is to check the top inch or two of soil; if it feels dry to the touch, water thoroughly until it runs out of the drainage holes. Ensure your planter has excellent drainage to prevent root rot.
Factors like plant type, pot material (terracotta dries faster than plastic), sun exposure, and season also dramatically affect frequency. Observe your plants and let the soil's moisture level, not a rigid calendar, be your primary guide.