snow on the mountain
• noun
An annual herbaceous plant (Euphorbia marginata) of the spurge family native to North America, cultivated as an ornamental for its clusters of small flowers surrounded by striking white-margined upper leaves and showy white petal-like floral bracts.
"The gardener planted rows of snow on the mountain to add bright white contrast to the late-summer flower border."
A variegated cultivar of bishop's goutweed (Aegopodium podagraria) in the carrot family, widely grown as a dense groundcover for its green leaves edged in creamy white and flat-topped umbels of tiny white flowers.
"Wait to plant the variegated snow on the mountain until you have a shaded slope where its spreading roots can be contained."
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