Please can somebody tell me what this plant is? I started growing some seeds last summer of this plant. They were tiny this time last year but overwintered in my greenhouse so obviously a hardy perennial. The person I got them from could not give me a name. He said the flower is a kind of spike shooting up in early Summer and it was a very dark purple. He got the seeds from a park near to where he works. I haven't been able to find the plant on the 'net'.