This plant is a thug. At least that's what some gardening books say. In gardening parlance a thug is a plant considered to be invasive and best avoided. Actually I like it and I think there is a lot to be said for plants that spread rapidly of their own accord.
 Trachystemon orientalis  is sometimes called 'Oriental Borage'. This is understandable because it is of the Boraginaceae family and the flowers do look like a mutant version of those on the commonly grown herb.
 It has many virtues. It's tough as old boots and copes with dry shade (the toughest of all areas to choose plants for). It flowers early in spring and the bees mob it. The big heart shaped leaves form a good groundcover well into the summer.
 The concern about invasive plants needs to be qualified. T. orientalis might be rampant with a bit more light and moisture but in this spot the conditions rein it in. Similarly I have included other "thugs" around the garden. They're vigorous but not a problem in places where their vigour can be used to good effect.