Seeds from this spectacular Butterfly Bush Buddleia Royal Red This is one of the real butterfly magnet. These gorgous 8 inch flower spikes are just covered with hundreds of these tiny deep ruby red blossoms, and the butterflies flock to them for all their nectar. The bush will grow to 6 feet and 4 feet wide and is hardy in zones 6-9. The seeds are tiny and just need to be sprinkled on top of the seed starting soil and kept moist to sprout lots of these bushes.