John Hoyland John Hoyland is a renowned gardener, writer and plantsman, and is the garden adviser at Glyndebourne. You can follow him on Twitter @johnhoyland. John Hoyland: The flowers to grow to create your own dye — just as they do at Glyndebourne John Hoyland, gardens advisor at Glyndebourne, on the extraordinary dye garden that is now being used to create costumes for the famous outdoor opera. Best climbing plants for conservatories Nothing beats the sun glinting through the conservatory windows on a chilly winter day, but what to plant inside? John Hoyland recommends the finest climbers.