Certain plants require more water than others. As a general rule for indoor plants, it is best to water when the soil in the root zone is just barely moist. When you touch the soil, it should feel cool and moist, but should not dampen your finger. Most soils are crumbly at this stage, but not dusty. Outdoor plants may require more water depending on temperatures and the amount of rain that you are receiving. For more information on the watering needs of individual plants, you may want to contact your Agricultural Extension Agent. You can also read about watering your garden in the Gardening Basics section of our site.