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Andy Lopez, Contributing Columnist/Invisible Gardener
8:40 am PDT March 15, 2017

Trees naturally take care of themselves. They have a deep root system that actively looks for sources of water and minerals. Look at the trees in nature, and you will see how they manage to survive months and sometimes even years without any apparent source of water. Trees have deep roots that go down four times as deep as the tree is tall!

After a good rain, your trees will not need to get any water from you for at least a month and, in many cases, a few months can go by before you should turn on their drip.