Coneflowers (Echinacea ssp.) Among top nectar producing plants for butterflies. Nectar production in some cultivars may be greatly reduced. Flower colors of native species and cultivars occur in shades of pink, even red, yellow, orange and white. Native species can be found in a range of soil and moisture conditions. Most cultivars prefer moist well drained soil. They prefer full sun (6+ hours of sun); some varieties may tolerate as little as 4 hours of sun. Height ranges from 1' - 5'.