Spreading the Starry Show: Propagating Calico Aster (Symphyotrichum lateriflorum)
Calico aster (Symphyotrichum lateriflorum), with its charming explosion of tiny, colorful blooms, brings a touch of whimsy to the late summer and fall garden. This native beauty, also known as side-flowering aster, is a pollinator magnet and a wonderful way to extend your garden’s season. If you’re lucky enough to have calico aster gracing your space, you might be wondering how to get more of this delightful plant. Fear not, propagating calico aster is easier than you might think! Let’s explore the most effective methods.
1. Division – The Gift that Keeps on Giving:
Division is the most common and arguably easiest way to propagate calico aster. This method involves digging up an established plant and separating it into smaller sections, each with its own roots and shoots.
- Timing is Key: Early spring or late fall, when the plant is dormant, is the best time for division.
- Divide and Conquer: Gently dig up the plant, ensuring you get a good root ball. Using a sharp, clean knife or spade, carefully divide the clump into sections. Aim for divisions with at least 3-4 healthy shoots and a good mass of roots.
- Replant and Rejoice: Replant your divisions at the same depth they were previously growing, water thoroughly, and watch them flourish!
2. Starting from Seed – Patience is a Virtue:
While slightly more time-consuming, starting calico aster from seed offers a rewarding experience.
- Sourcing Seeds: You can collect seeds from your existing plants (they resemble dandelion puffs) or purchase them from reputable suppliers.
- Cold Stratification – Nature’s Trick: Calico aster seeds benefit from cold stratification, mimicking the natural winter chilling they experience outdoors. You can do this by placing the seeds in a moist paper towel within a sealed bag and storing them in your refrigerator for 4-6 weeks.
- Sowing Time: Sow the stratified seeds indoors 6-8 weeks before your last expected frost, or directly outdoors after the danger of frost has passed.
- Light and Moisture: Keep the seed starting mix consistently moist and provide bright, indirect light. Seedlings should emerge in 1-3 weeks.
- Transplanting: Once they have at least two sets of true leaves, harden off your seedlings and transplant them outdoors.
3. Cuttings – Cloning Your Favorites:
For a more hands-on approach, try propagating calico aster from cuttings.
- Choose Wisely: Select healthy, non-flowering stems in late spring or early summer.
- Cut and Dip: Make a clean cut just below a leaf node, remove the lower leaves, and dip the cut end in rooting hormone (optional but helpful).
- Planting the Cuttings: Insert the cuttings into a well-draining potting mix, moisten the soil, and cover the pot with a plastic bag to create a humid environment.
- Rooting and Growth: After a few weeks, gently tug on the cuttings. Resistance means roots are developing. Once rooted, you can transplant them into larger pots or directly into your garden.
Caring for Your New Aster Army:
No matter your chosen propagation method, provide your new calico asters with well-drained soil, moderate watering, and at least 6 hours of sunlight per day. A light application of balanced fertilizer in spring will encourage healthy growth and abundant blooms.
With a little effort and these propagation techniques, you’ll soon have a multitude of calico asters lighting up your landscape, attracting pollinators, and bringing joy to your autumn garden for years to come!