I bought a small snapdragon, put it in a container and in just two months it exploded, its now 3 times the size it originally was with absolutely zero care.
The really great thing is the bees are in love with it! You cant see as most of them have gone inside the flowers, but there's usually about 5 or 6 at a time digging into it from dawn to dusk, its lovely to see.
I also read that wasps and honey bees can't get into the flowers: the only ones strong enough to open the jaws are bumblebees.
PLANT SNAPDRAGONS!