Wall-pepper has various names, each one emphasizing a particular feature or two. The name wall-pepper comes from the fact that it can grow in notches in a stone wall and it has a strong peppery flavor. Sometimes it takes awhile for the sharpness to take effect, but once it does ... It's not so strange that this plant is used as a flavoring. Because it is a succulent plant, storing water in its fleshy leaves, it is resistant to drought. In general, you don't tend to notice this plant among all the other vegetation. However when it blossoms, the ground turns into a sea of yellow stars!
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