PlantFiles Pictures: Rock Cress 'Snowcap' (Arabis alpina subsp. caucasica), 2 by DonnaMack

DonnaMack wrote:
No, they don't compete with much of anything. They slowly spread. In my new yard I have it under a big crabapple. It can take full sun with moisture, or partial shade. I am germinating some more now. It's a wonderful plant it and forget it plant. I have it in really poor conditions, and really good one. It remains in the winter, turning a grey green. It has been there since 2007!

The first picture shows it in a horrible, neglected are, uncomposted, near the hosecart. It gently spread. Death to most plants. That's what convinced me to put it under my fothergillas, for a color echo. It's a wonderful, non-agressive plant, which is why it can be so neglected.