These items represent viable propagules of a flowering plant prized for its distinctive coloration. Specifically, the descriptor denotes seeds harvested from cultivars of Achillea millefolium (yarrow) exhibiting blooms with hues reminiscent of a summer evening: the orange-yellow of fireflies, the soft blush of peaches, and the serene blue often seen in the sky. An example would be a packet labeled as containing the specified seeds, intended for planting to produce plants with the described floral characteristics.
The importance of selecting these seeds lies in their potential to yield plants with specific aesthetic qualities. Yarrow, in general, is valued for its medicinal properties (traditionally used for wound healing), its ability to attract beneficial insects to the garden, and its drought tolerance. Cultivars selected for unique flower colors, like those implied here, offer the additional benefit of enhancing the visual appeal of cultivated landscapes. Historically, yarrow has been cultivated for both practical and ornamental purposes, and specialized seed selection represents a continuation of this horticultural tradition.