For many years we had cushion spurge (Euphorbia polychroma) growing above our loose limestone retaining wall. When we had a much larger retaining wall put in a little over 10 years ago now, that spurge got buried in the earthwork.
Seeds must’ve survived in the soil because this year spurge has emerged all along the top of the retaining wall—in a location about 3 feet higher than where the original spurge thrived.
It’s even peeking out of the pavers:
Cushion spurge is a border perennial that offers yellow flowers in late spring and reddish-orange foliage in the fall.
It won the Award of Garden Merit from the Royal Horticultural Society in 1993, and this plant grows about 12 to 18 inches tall and wide.
