Outside 30 Yr Old Yucca Tree Failing This Year

Question

Leaves yellowing and dropping quite soon after new growth, it is in a windy, full sun position on the north coast of Devon. It has rocky slatey ground and not much soil. What can I feed him to stop a total demise, or has he reached the end of his life? (assuming it’s a male tree!!)

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Answer 1

It is natural for the lower, older leaves to yellow but new growth should not. Has there been a lot of rain lately? If not, it may have an insect problem. I see some white spots on the leaves but can't get a good look. Try spraying the leaves with water if you can reach. I don't think it is the age, because some yuccas can live hundreds of years. A light application of a balanced fertilizer (such as 10-10-10) may help. Here is more:

https://www.gardeningknowhow.com/ornamental/foliage/yucca/yellow-yucca-leaves.htm

https://content.ces.ncsu.edu/yucca-plant-bug-1