Annabel Streets is searching for a conifer. It is a bright, early March day and we are looping around the gardens of Fulham Palace in southwest London. She spots what she is looking for: a large spreading yew tree. We stand looking up at the clusters of leathery, spiked leaves and breathe deeply. “Every day I stand under an evergreen tree now,” she says. “I have become obsessed with terpenes.”
Terpenes are a type of organic compound produced by plants, part of a protection system against insects, disease and rot. They are the reason pine trees smell piney and citrus trees smell citrussy. They are also one of the reasons humans are drawn to trees. The presence of these tiny molecules has an anti-inflammatory effect on the body. Laboratory research has shown that the terpene a-pinene, found in conifers such as our yew tree, could have properties that prevent cancer. Studies on the citrus compound D-limonene suggest it is an effective mood-booster and antidepressant.
