Lavender - it looks gorgeous and it has all sorts of medicinal uses. If you can, try and avoid humming dilly, dilly while you read through this article, but to be honest, now I have put the tune in your head, you may well find that impossible.
From the article:
Lavender is perhaps one of the best known of essential oils and it is the perfect addition to the home first aid kit. Lavandula officinalis has dozens of uses around the home. It has an uplifting fragrance and can be used in every room of the house, including the laundry, but it is also very versatile as a treament for everyday ailments.