May 11, 2001, Newsletter Issue #27: Spring Growth
Tip of the Week
Watering your lawn is something that, if not done properly, can do more damage than good. There are three basic concepts that you need to understand in order to irrigate properly.
First is timing. If you water your lawn on a regular, clock-work basis, be prepared to mow just as robotically and scout for pests that much more frequently as well. You may be better served waiting until your lawn shows signs of stress--such as rolling leaves, discoloration, strawlike appearance, etc. Watering when your grass needs it encourages drought resistance.
Second is the depth of moisture penetration. You need to moisten (not drench!) the soil to the bottom of the root zone. This is generally between 4 and 6 inches, depending on grass type. In typical soils, one inch of water applied to the lawn will result in moistening the soil to about 4-5 inches. Heavier soils will require more water, with some time with the water off to allow percolation. Sandier soils will require less water, but will need it more frequently. Thereīs an old rule that one inch of water per week.
The third thing to remember is simply to never, EVER water at night. Donīt even water late in the afternoon. Why? Because darkness, warm temperatures and moisture are all necessary conditions for the development of fungal diseases. If you have had disease problems in the past, I would be willing to bet that you had water standing on the lawn by nightfall several nights in a row.
Water when your grass needs it, give the grass enough water to help it develop deep roots and drought resistance, and make sure the grass is dry by nightfall.
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