Gum rosin (the most common source) is recovered from the sap of living pine trees. Wood rosin is extracted from pine stumps. Tall oil is obtained as a by-product of paper pulp production.

It’s spring, which means one thing: the RHS Chelsea Flower Show is back, with a raft of new gardens for visitors to enjoy.

As we journeyed into the heat of Sakha’s larch-and-alder lowlands ... scented with tangy sap, seemed anathema to all manner of insects. I found the only sure way to escape bites was to stand ...