The pink flowers are an unusual shape,  looking a little like the heads of turtles which is where they get their name from; the bright pink colouring contrasts nicely with the deep green toothed leaves. The flowers last a long time too so you can appreciate them for several weeks over the summer and well into autumn. They'll grow well in more or less any type of soil as long as it isn't too dry. If you have a stream or pond in your garden, this is the perfect choice for adding some colour alongside it. It likes the sun but it will also grow fine in a spot that's partially shady. They're pretty resistant to disease and aren't often bothered by pests so this species doesn't need a lot of tending to. It will also attract butterflies to your garden. If you want more plants it's easy to divide it every few years.

Top tip: Before the flowers bloom, pinch out the tips and you'll get larger, bushier blooms.