Ahmed bin 'Ubda bin Musa أحمد بن عبدة بن موسى · The Chapters Regarding Zakat

that his Father said: “I heard the Messenger of Allah say: 'For whatever is irrigated by the sky, rivers and springs, or draws up water from deep roots, one-tenth. For whatever is irrigated by animals (i.e. by artificial means) one half of one-tenth.' ”

Mu'adh bin Jabal said: “The Messenger of Allah (ﷺ) sent me to Yemen and commanded me to take one-tenth of that which was irrigated by deep roots, and to take one half of one-tenth of that which was irrigated by means of buckets.”

the Prophet took one-tenth of honey (as Zakat).