Heterocentron macrostachyum goes by the common name Spanish shawl, and it's about as far from the shrubby, upright habit of Tibouchina as this family gets. It's a trailing, mat-forming ground cover native to Mexico and Central America, with small magenta-pink flowers scattered across wiry stems that root as they spread.

A groundcover that happens to be a melastome

Most people who grow Spanish shawl have no idea it's related to Tibouchina or Medinilla — it doesn't look the part. But look closely at an individual flower and the family resemblance is obvious: five petals, the same slightly asymmetric arrangement of anthers you'd find on any melastome bloom. It's a good reminder that this family's diversity of growth habit is wider than the shrubs and small trees most people picture.

In cultivation it's forgiving. It tolerates poor soil, handles part shade to full sun, and spreads readily as a low mat over rock walls, hanging baskets, or bare garden edges. In mild-winter climates it stays evergreen and flowers on and off through most of the year; in colder areas it's usually grown as an annual or brought indoors.

Keeping it in bounds

The same vigor that makes Spanish shawl a good problem-solving groundcover can turn into a maintenance chore — it roots wherever a stem touches soil, and left unchecked it will climb into neighboring plants. A once-a-season trim keeps it tidy without much effort, and any trimmed piece with a node will root in water within a couple of weeks if you want to expand your planting.

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