I think I bought my snapdragon in July- it is a bit leggy and wanting to flatten to the ground and each branch separates out, but I was looking to prune it; however it won't stop flowering . I live in London and it's north facing.Is this normal?
I'd leave it alone and enjoy it flowering. They're short-lived plants and fairly tender, so usually die off over winter unless they're in a very sheltered position as yours is.
Most people treat them as annual bedding and pull them up and discard them in the autumn, but if yours doesn't get frosted it may last a couple of seasons.
I'd leave it alone as well, it will probably seed if you don't deadhead it and you'll get the next generation.
aha, thanks both!