Tree2mydoor.com does for trees what florists do for flowers.
They send trees (or bushes, or plants) through the post as gifts.
So with Father's Day coming up, why not take a look at their website? You could send your dad a tree, or a bush or plant, and there's even a section to help you determine what sort of gift to send, depending on whether your Dad has a big garden, a small garden, no garden, a balcony or conservatory... it makes it all much easier.
Two gift ideas....