I just did a search on Google and stopped counting at 8 pages of web sites. Lots of information out there. If you need me to pop some links in here, let me know. It is perennial, but to what zone, I didn't see. It is also called Twinspur. If it quits blooming in the heat of the summer, one site suggest cutting it back to an inch or so and it will start growing again for nice fall bloom. There are a lot of different colors of this plant, but the dark pink looks to be the prettiest to me. Logee's even has one, I believe apricot color, for sale.
What species is it? D barberae is a popular trailing hanging basket flower here, these tend to be mat forming perennials but are tender and grown as annuals, saying that we keep ours in the greenhouse where they seem to survive quite happily. They have a very long flowering season too.
They need moist but well drained soil in full sun or partial shade in the UK, in the US it may need shade in the hottest parts of the day.