Mulligan (Agriculture Canada, Ottawa, retired)
Sedum acre L., mossy stonecrop, orpin âcre
A creeping, densely matted, succulent, perennial with clusters of small yellow flowers. It was introduced from Europe for use as a rock garden plant and as a ground cover. It has become sporadically naturalized, throughout our area, as a weed in lawns, gardens, and waste places, especially on shallow soils that are low in fertility.