When is a harebell not a harebell?
In February I started some Thompson and Morgan harebell seeds. I carefully nurtured them until they were ready to harden off and transplant. I was a little surprised when the biggest seedling sprouted a viola flower. Now the next biggest is as pictured below - it has campanula - like characteristics but the flower is not a harebell. I will admit that I didn't use sterile compost, but it doesn't look like a weed,or anything I've grown before! Any ideas?!