The frequency of watering plants in planters largely depends on various factors such as the type of plant, the size of the planter, the type of soil, and the climate. Generally, plants in containers need more frequent watering than those in the ground. This is because they have less soil to hold onto moisture.
In a moderate climate, you may need to water your plants once every two to three days during the growing season. However, in hotter climates or during a heatwave, you might need to water them daily. Conversely, during cooler months or in less sunny indoor environments, watering may only be necessary once a week or less.
It's important to check the soil's moisture level before watering. You can do this by sticking your finger about an inch into the soil. If the soil feels dry at that depth, it's time to water. If it feels moist, you can wait a day or two.
Remember, overwatering can be just as harmful to plants as underwatering. It's always better to err on the side of caution and water less frequently. Always ensure that your planter has good drainage to prevent water from sitting at the bottom, which can lead to root rot and other problems.
In conclusion, while there's no one-size-fits-all answer to how often you should water plants in planters, monitoring the soil's moisture level and understanding the specific needs of your plants will guide you in maintaining their health.