leaf apex; tip of a leaf
Botanical term for the very end of a leaf. Used in gardening, plant descriptions, and nature observation.
This plant has a pointed leaf tip.
葉先が枯れてきたので、水やりを控えた。
The tips of the leaves started to wither, so I cut back on watering.
A native compound of 葉（は）, “leaf,” and 先（さき）, “tip.”