Sea willows are generally born on seabed rocks with a water depth of more than 30 meters and a height of 3-4 meters. Scientific name black coral, because it grows into a big tree, with delicate branches and flexible texture, similar to willow trees on land, so it is named sea willow. Although it looks like a tree, through marine scientific research, it is a marine animal, belonging to coelenterate and one of Corallinae.
When it first came out of the water, the leaflets on the branches sparkled and the branches were elastic. After being out of water for a period of time, the branches become very hard. Because there are red, white and yellow water ghosts when the sea willow comes out of the water, it can turn black and iron when it is dry, so it is also called sea iron tree.
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Sea willow is tough in texture, bright in color, soft in luster and strong in fire and water resistance. It is an excellent material for making various works of art. The cigarette holder made of it has a certain filtering effect on nicotine, and it is cool and refreshing when smoking, which is deeply loved by people. It is often processed into various handicrafts, such as bracelets, ornaments, cups, rings and so on. Ancient sea willow products are noble playthings of emperors, generals and dignitaries.
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