Q.New Jacaranda tree leaves turning yellow
On my new Jacaranda tree, which was in a 10 gallon container and is about 6 ft tall, some of the leaves are turning yellow and they don’t look so good. Tree was planted about 3 weeks ago in full sun in East Mesa, AZ. Am I giving it too much water, or not enough? I have been watering once a week about 3 gallons.
Yellowing leaves is generally an indicator of a watering issue, especially in a newly planted tree.
Make sure you have correctly placed the tree and that you are watering correctly.
Soil should be kept moist. You will need to be checking the soil instead of watering on a schedule.
The amount you mention is not likely enough.
https://www.gardeningknowhow.com/ornamental/trees/jacaranda/jacaranda-tree-information.htm