Answer: How much and how often to water your trees depends upon their size and age. Here's a website with a graph to show you how much water to apply depending upon the size of your tree, plus a calendar showing how often to water, depending upon season. I think you'll find it helpful. http://cals.arizona.edu/pubs/crops/az1151.pdf
Rooting hormone ensures that a cutting will root, but it won't have much effect on how quickly a plant will grow. Growth rate depends upon the plant, the temperature and the amount of care it is given.
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