How often to water is simply when the root zone dries out.
What the heck is a root zone? The root zone is the area of the soil that roots are present from the plant.
For example, let’s take a three gallon shrub; the root zone is approximately ten inches deep and wide.
Just because the soil is still moist a foot or two away from the newly installed plant does not mean the root zone is also moist.
As a general statement, most freshly planted annuals, perennials, shrubs, trees, etc. should be watered every one to three days; this does not account for Mother Nature’s help.
As the plant gets established and the root zone expands, the frequency that it needs water will go down.
As our temperatures rise in the summer, most plants will need to be watered more often because their roots are absorbing water much quicker.
Now that you know when, let’s talk about how!
The proper way to water almost all plants is to deeply soak the root zone. An important fact to remember is that 90% of the water that a plant takes in is absorbed by the root system. Watering in the morning is best; plants mostly need water from sunrise to sunset. The plant’s need for water goes down at night. Plus, the more moisture present after dark, the more potential problems you will have with fungus.