Cochise County Master Gardeners

Knowing when to water and how to water plants is one of the most important aspects of gardening and also one of the most complex. A great portion of Arizona is either arid or semi-arid and ever-increasing demands are being placed on our limited water resources. As water for landscapes and gardens utilizes roughly 60% of the total water consumed by residents, it is important for us all to make wise decisions about the use of this water for irrigation purposes. Most of a plant's absorbing feeder roots spread 1 1/2 to 3 times the width of the plant's canopy. It is important to water the entire root zone each time irrigation is applied to maintain a healthy, well-distributed root system. Most of the water that plants absorb is outside the canopy drip line not at the base or trunk of the plant. The best time to water is in the morning or evening when air temperatures are lower than at midday, reducing evaporation. In the evening do not wet foliage; this can encourage the growth of fungus or mildew, making plants unsightly and jeopardizing their health.