Lighting experiments to make plants luminous in the dark, performed for SIGN. Trees and plants were coated with a phosphorescent bio-based coating and charged with LED lighting with a spectrum near UV. As a result, the trees and shrubs glow in the dark. The installations can thus become a sustainable alternative to orientation lighting or an atmospheric landscape element in the darkness. This was first applied in the interactive lighting installation with 21 luminous trees in the GreenNest Park in Amsterdam South-East.