The Poison Garden

In the north of England, there's a beautiful garden. It's full of delicate wildflowers, extravagant blossoms, verdant climbing vines, and tumbling water features. Like so many gems of English horticulture, Alnwick Garden, has much to delight the visitors who flock there every year.

However, there's one part of the garden that is more famous than all the rest. Forbidding black iron gates bar visitors from entry. What's behind the gates looks unremarkable to the untutored eye. More plants. Beautiful, perhaps, but not more so than those outside the gate. Why bar the…