Astilbe. Shade perennial plant, blooms early summer. shades of burgundy, red, pink, lavender, and white. also finely cut foliage, which in many varieties is flushed with bronze. grows best in Zones 4-8 and can reach up to 4 feet tall, depending on variety. Test Garden Tip: Astilbe needs consistently moist soil to thrive, so it's a good choice for areas that don't drain well. Top Picks: 'Deutschland' bears pure white flowers; 'Sprite' is an award-winning selection with shell-pink blooms.