The wrong plant.

When I went to the Harrogate flower show I bought what I thought was a salvia. Only to find it was a gentian- oops. Luckily now when it's opened, I like it. I looked it up to see what conditions it likes and what problems it has. Prone to mildew, honey fungus, aphids and snails. It's going to have to be tough to survive in my garden.