Scientists have been campaigning to turn the fast-growing Azolla into a food of the future. Others envision it becoming both a sustainable biofuel and a fertilizer that captures carbon.

It seemed a shame, then, that a highly nutritious fern called Azolla — that green mat ducks eat on ponds — long ago made a pact with a species of cyanobacteria, an “endocyanobiont.” ...

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.

Salvia can be annuals, biennials, herbaceous or evergreen perennials, or shrubs. They have paired, simple or pinnately lobed, often aromatic leaves and 2-lipped flowers in whorls, forming simple or ...