Q.My tree is a ruby red has done well but right now its leaves are turning yellow. I’m in Arizona it’s getting watered 20 min
every day what can I do?

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on July 2, 2020
Temperature fluctuations, improper watering, or scale insects can all cause yellow leaves dropping. If your tree is established, a deep watering once a week is all it needs except in times of dry periods.
Check your cultural conditions, check the leaves for bugs, and a soil test would help if it's a nutritional problem.
https://www.gardeningknowhow.com/edible/fruits/grapefruit/growing-grapefruit.htm
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