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Memorial tree is a tree burial product,Ashes of the dead is planted with a tree into memorial tree. Then users can commemorate their departed families by watering and fertilizing the tree. On the top, there is a water tank connecting to the tree root. Users can carry out water injection while putting ghost-money-like fertilizer rich in calcium oxide(CaO) into the tank. When the CaO money meets the water, the exothermic reaction can be caused, generating a mass of vapor. This is same as the smoke created by burning spirit money. people can worship their loved deceased ones in a green manner without burning paper money