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Astilbe is a popular perennial plant known for its feathery plumes and vibrant colors. Over time, astilbe can become crowded, which may reduce its flowering and overall health. Dividing astilbe is an effective way to rejuvenate the plant and expand your garden.
When to Divide Astilbe
The best time to divide astilbe is in early spring or late fall, when the plant is dormant. This minimizes stress and allows the divided plants to establish roots before the growing season. Avoid dividing during hot summer months, as the plant may struggle to recover.
Tools and Preparations
- Sharp garden spade or shovel
- Garden fork
- Pruning shears or knife
- Gloves
- Compost or organic matter
Steps to Divide Astilbe
Follow these steps to successfully divide your astilbe:
1. Prepare the Plant
Water the plant thoroughly a day before dividing to reduce stress and make digging easier.
2. Dig Up the Plant
Use a garden fork to gently loosen the soil around the base of the plant. Carefully lift the entire clump out of the ground.
3. Divide the Clump
Use pruning shears or a sharp knife to cut the clump into sections. Each section should have at least one healthy crown and a good root system. Avoid dividing into very small pieces, as they may not establish well.
4. Prepare for Replanting
Amend the soil with compost to improve drainage and fertility. Dig holes that are wide enough to accommodate the root systems of the divided plants.
5. Replant the Divisions
Plant each division at the same depth as the original. Water thoroughly to settle the soil and eliminate air pockets.
Maximizing Visual Impact
To create a striking display, plant the divided astilbe in groups rather than single plants. Space them about 12 to 18 inches apart, depending on the mature size of the variety. Consider planting in clusters of three or more for a fuller look.
Additional Tips for Success
- Choose healthy, vigorous plants for division.
- Water regularly during the first growing season.
- Mulch around the plants to retain moisture and suppress weeds.
- Fertilize in early spring with a balanced fertilizer.
- Remove spent flower stalks to encourage new growth.
By following these steps, you can successfully divide your astilbe and enjoy a vibrant, lush garden display. Proper division not only enhances the health of your plants but also provides an opportunity to expand your garden with minimal cost.