Rock Cress - Excellent evergreen ground cover, producing cushions of pretty purple-blue flowers. It can be planted along the edge of a bed or lawn, or in the rockery, but is also very effective in a hanging basket displaying a profusion of colour.
When repotting a plant, turn a plastic pot upside down in the new, larger container and add soil around it. When you're done, pull out the plastic pot and there will be plenty of room inside the bigger container to place your plant's root ball. Duh, why didn't I think of this?
How to make a flower tower