Q.Severe Heat Stress
In 2019 my well established (20+ year old) macadamia nut tree was subjected to extreme high heat conditions for about a week. During this time the tree was not watered. All leaves have fallen off the tree. The tree has not yet returned to its former self. There has been no new leaf growth other than some shoots near the base of the trunk. Will my tree return to a normal state? If so, what can I do to help revive it?
Certified GKH Gardening Expert
I suspect that more is amiss than drought stress. They are susceptible to insects and disease. If you haven't seen leaves since 2019 it may have succumbed. Here is a scratch test you can try. If it is still alive, seek the help of an expert at your local cooperative extension or an arborist.
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-leafing-problems.htm
https://www.gardeningknowhow.com/edible/nut-trees/macadamia/how-to-grow-macadamia-trees.htm
http://blogs.ifas.ufl.edu/volusiaco/2018/03/22/macadamia-production-as-an-alternative-crop/
