The Astilbe perennial flowering plant, also referred to as False Spirea, is a partial shade loving plant that produces feathery blooms in the colors of pink, white and red. The plant reaches a height of 1 to 6 feet with fern like dark green foliage that offers garden appeal during the entire growing season. The Astilbe plant grows well in USDA growing zones 4 through 8 and is recommended for planting in flower beds instead of a container.
Prepare a planting location for the astilbe plant that has a well draining, nutrient rich soil and partly shaded light conditions. The plants will grow in full sun; however the soil must be watered daily to prevent drying.
Work a generous amount of compost into the planting area to increase the soil nutrient value and moisture retention abilities.
Dig a hole that is the same depth as the container the plant came in and slightly wider. Remove the plant from the container and gently separate the roots. Place the plant into the hole and fill in any remaining space. Space astilbe plants one foot apart from each other.
Water the plants immediately after planting. Water the plants regularly during the growing season when the rainfall levels are below one inch per week. Astilbe plants prefer a good soaking watering instead of several light waterings.
Apply a 2 to 3 inch layer of mulch around the plants to prevent weed growth and increase moisture retention in the soil.
Remove plant blossoms after the blooming period if complete. Astilbe plants will continue to grow attractive foliage after the blooming period.
Apply a high nitrogen fertilizer after blooming is complete in the fall season.
Propagate the astilbe plant by dividing the root sections in either spring or fall seasons.