It is Achimenes, formerly known as the Hot Water Plant. Grown from rhizomes, and originate from central America. They can be obtained from Dibleys, at Ruthin in North Wales, they have a lovely selection of colours.

They make a huge number of corms that you can grow on, so you never need to be short of them again!

What a lovely healthy row of pots you have there!

I grow these, too - and I stop watering them when they finish flowering, dry the pot out and then tip the whole lot into a tray in the spring, rescue the 'corms' or 'rhizomes' and replant them in fresh compost. Off they go again - they do make more corms each year. Lovely plants. :-)

Thank you so much everyone. These are truly lovely plant and as Spritzhenry and Steragran say they are so easy to grow and give such pleasure - now we know what to call them. Thank you much again

They are very late to sprout, though, so don't give up on them. The rhizomes look like little pink scaly sausages. Plant them into new compost, on their sides and cover with quarter inch of compost. Keep moist until they sprout at end of May or in June.