One of the common questions about watering gardens is: "How long I should water for"?
If anyone tells you that about a half hour is good for watering the lawn and forty minutes for the drips, then you know that this person hasn’t the foggiest about irrigation.
Irrigation amounts for gardens is a very complex issue, even for many people who deal with gardening.
The amount of water required for irrigation depends on a number of factors such as geographic region, soil type, plant type, time of year, the type of irrigation equipment, flow rates, etc.
There are calculation tables (which we will not go into here), that can indicate the amount of water that will be returned to the ground. What is important for you to know and is relatively easy to implement, is the need for separate and uniform irrigation for each type of plant.
Plant Type: For home gardens, this refers to similar plant groups in terms of their irrigation requirements, such as trees, shrubs, seasonal plants, grass, etc. With proper irrigation, each group is assigned a separate irrigation line through which one can distribute the correct amount of water required for the same group of plants.
It is inconceivable that trees and potted flowers share the same irrigation line. Even watering intervals and duration are completely different and would cause damage to one of the plant types and a waste of water.
The operative conclusion for you: make sure you have a computerized irrigation system which can operate several taps and separate lines of irrigation according to plant type. While a computer managing a single line is cheaper than a four or six-line computerized irrigation system, in the long-term, saving water and distress caused when plants die is worth every penny.