24+ Seeds of Blue Porterweed (Stachytarpheta urticifolia), plus germination and care instructions.
Blue Porterweed actually has flowers that are a violet-purple and, although small, they attract all sizes and types of butterflies to their sweet nectar. This is a must have in your butterfly garden!
Growing to about 4" high, it can be grown as a self-sowing annual in colder zones or as a perennial in zones 9-11. These do drop a lot of seeds, so some thinning of 'volunteers" each year will be necessary, but the butterflies will love you for your effort! These can grow in full sun to part or bright shade and are fairly drought tolerant once established.
These bloom continuously throughout the summer until hit by a frost.