If you're very quick you can make your own rainbow roses, or other flowers. You'll need a white rose, some food colouring, a knife to split a stem and some time.has the details at AoB Blog.
Roses are red – but they don’t need to be, if you know how to use food dyes and Fibonacci
Valentine’s Day is here and unless you share the cynics’ view that this is a holiday invented by the flower industry, you might set off to buy a bunch of flowers for your other half on the day. Nex……