2. Little Blue Wonder Sea Holly
The small blue flowers on this plant resemble the same blossoms seen on thistle plants. Every individual branch on this plant produces more than 100 bright blue flowers. The blue color is long lasting, even when the flowers are allowed to dry. Gardeners living in zones 5 thru 9 should have no problem getting these little gems to #grow successfully. They bloom from the middle of summer to fall and can be planted in sunny or shaded areas.