Propagating an Astilbe

What You'll Need
Astilbe flowers in your garden or a container
Small garden spade
All-purpose fertilizer with a lot of nitrogen content
Super phosphate or animal manure
Organic mulch

Astilbe flowers should be propagated every 3 or 4 years to maintain healthy plants and promote new growth of blooms and flowers. You can also propagate astilbe flowers at other times if you simply want to create more plants. Properly propagating astilbe flowers is not very difficult and anyone can do it. So, here is a handy how-to guide on how to properly propagate astilbe flowers

Step 1 - Know When to Divide and Propagate

It is usually best to propagate astilbe flowers in the late fall after blooms have died or in early spring before astilbe flowers and plants have grown enough to produce blooms and flowers. When propagating astilbe flowers, you don't need the top parts of the plant so much as you do the crown, stem and root ball. So, even dividing and propagating astilbe plants that are only 2 to 4 inches in height is acceptable and will work just fine.

Step 2 - Dig Out the Astilbe Plant

Use your small garden spade to carefully dig around the astilbe plants to be removed and divided. Make sure to begin digging around the approximate drip line of the astilbe plant as this will probably be the point to where roots have extended to. After you dig out the astilbe plant, gently remove it and carefully remove any loose dirt or soil clinging to the root ball.

Step 3 - Divide the Astilbe Plant

Use your fingers to gently pull apart the crown section and root ball of the astilbe plant. Divide the root ball in quarters if possible. Alternatively, you could use a small pair of scissors for this task.

Step 4 – Choose a New Location

Choose shaded areas to plant your new astilbe divisions. Astilbes will grow better in shaded areas and don't do so well and direct sunlight.

Step 5 - Prepare the Soil

Turn the soil in the new location with a good all-purpose fertilizer that has a high nitrogen content. Also add a light application of supers phosphate or animal manure to the soil.

Step 6 - Plant the Divisions

Dig holes that are the same depth as used for the original astilbe plants and insert your new divisions in the holes. Pack soil around the new divisions tight enough to keep the plants upright but not so tight as to damage the crown or stem. Also make sure to space your new divisions about 16 to 30 inches apart

Step  7 - Add Organic Mulch

Add 2 or 3 inches of organic mulch around the area of for your new divisions. Make sure to allow enough room around this stems to allow the new divisions to grow properly.

Step 8 - Apply Fertilizer

Apply more all-purpose fertilizer in your new division planning area.

Step 9 - Water the Astilbe Transplants

Thoroughly water the new astilbe transplants, but make sure not to soak the soil too much. Add water in increments and allow the water to soak in to the soil before adding more.