University of Illinois Extension Watering - Successful Container
Gardens - University of Illinois Extension   Because
containerized plants have a very limited soil volume, proper
watering and fertilizing are critical in maintaining an
attractive pot throughout the growing season.  How often you
need to water a container varies depending on the time of the
year, location of the container, how long the container has been
planted, type of container, and type of plant material. There
are no hard and fast rules when it comes to watering. That is
why you have to be watching your containers on a regular basis
and understand the requirements of the plants you choose to put
in the containers. While there are all kinds of water meter
devices on the market they are really no substitute for
observing the plant and using your finger to see how moist or
dry the soil really is.  Watering should be done when the plants
need water and preferably before they start to show signs of
wilting severely. Quality and overall heath of