Umbilicus

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If you have a drystone wall or other rockwork with a shaded side [north aspect or high shade], just jam a plant between rocks and it will be with you forever, self seeding into suitable crevices.  The parent plant dies after bloom, producing clouds of tiny seeds -- I got my population as contaminant in seed of a campanula. Umbilicus may grow, a bit more lush, in rubble at the base of the rockwork, but it will not invade open soil or vegetated areas in your garden.

 

U.rupestris is sometimes called wall-pepper; it is closely related to Sedum. It's common in walls all over Western and Mediterranean Europe.

 

loren russell

corvallis, oregon, usa