My 2 Very Large Indian Rosewood Trees’ Leaves Suddenly Turned Brown. Trees Have Been Healthy For 20 years And Never Before Had Brown

Question

leaves. They do not get prunes as they are 40 f-50’ tall. The branches still have resiliency. What can I do to restore their health. Thanks There are a few places on one tree that still have green leaves

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Answer 1

You are in zone 9 and the trees are hardy in zones 10 and 11 and 9 after establishment. I'm wondering if you had a cooler winter than normal that zapped it. Older trees can be seriously injured below 30 degrees F. Here is information on saving cold damaged plants.

https://www.gardeningknowhow.com/ornamental/trees/indian-rosewood/dalbergia-sissoo-information.htm

https://www.gardeningknowhow.com/ornamental/trees/sissoo/sissoo-tree-information.htm

https://www.gardeningknowhow.com/ornamental/trees/tgen/winter-damaged-trees-shrubs.htm