What viriditas actually means
It gets translated as “greenness”, which makes it sound like a colour. Hildegard used it for something closer to sap — the wetness in a stem that means it is still alive, still able to heal. A plant with viriditas bends. A dry one snaps.
She applied it to people too. Someone who had gone brittle, who had stopped being able to recover from things, had lost their viriditas. I put the word on the labels because it is the only word I have found for what a good cup of tea does on a bad day.