Plant World, the child of plant-obsessed entrepreneur Ray Brown, offers an amazing range of seeds, mostly ornamentals, but with veg and other edibles becoming increasingly important. There is so much here that is impossible to find elsewhere, much of it collected from plants growing in the four acre display garden in Devon, famously laid out as a map of the world. www.plant-world-seeds.com

Use code GM20 to get a 20% discount.