Asters, also called Michaelmas daisies, are hardy perennials that bloom in late summer and autumn.
With their vibrant, daisy-like flowers, they thrive year after year.
Asters are perfect for mixed borders, attracting beneficial wildlife with their abundant pollen and nectar!
Types of Asters to Grow
Aster amellus, commonly known as the European Aster, is one of many species in the Aster family. Native to Europe, it thrives in the UK's climate. North American Asters, such as those in the Symphyotrichum and Eurybia genus, are also popular. These Asters typically grow to about 50 cm (20 inches) tall and feature dark green foliage and vibrant composite flowers, primarily in lilac, though pink varieties are also available.
Popular Varieties of Aster
Aster amellus (King George): Known for it's long flowering period and large flowers.
Aster amellus (Rosa Erfulling): Soft pink flowers with a compact, clumping habit, ideal for small borders.
Aster amellus (Sonia): A pink cultivar that can grow up to 60 cm (24 inches).
Aster amellus (Veilchenkönigin): Purple flowers and mildew resistance, perfect for humid conditions.
What You’ll Need to Grow Asters
Tools & Supplies:
Gloves
Garden spade
Horticultural grit
Aster plants
Miracle-Gro Peat Free Premium Border Booster Soil Improver
Watering can
SlugClear & Snail Barrier
Miracle-Gro Peat Free Premium Fibre Smart Mulch
BugClear Ultra 2
Where to Plant Asters
Aster amellus thrives in garden borders with plenty of sunlight. Ensure the soil is well-drained and consistently moist. Avoid heavy clay soils. Asters grow well with plants like Rudbeckia, Chrysanthemum, and Phlox, offering a classic cottage garden vibe. Space the plants 50 cm (24 inches) apart to allow them to spread. If space is tight, Asters can also be grown in containers but require close attention to moisture levels.
How to Plant Asters
1. Prepare the Soil: Dig a hole a bit wider and deeper than the rootball of the Aster.
2. Add Grit: Place a spade full of horticultural grit at the bottom of the hole for better drainage.
3. Plant the Aster: Position the plant so that the top of the rootball is just below the soil surface.
4. Backfill: Gently firm the soil around the roots.
5. Feed: Add Miracle-Gro All Purpose Continuous Release pellets, avoiding the stems.
6. Water: Give the plant a good soaking.
7. Protect: Apply SlugClear & Snail Barrier to protect from pests.
8. Ongoing Care: Keep watering until the plant is well-established.
Caring for Your Asters
Watering: Water regularly, especially when the soil is dry, especially for container-grown Asters.
Fertilising: Feed at planting time in spring with a slow-release fertilizer.
Deadheading: Remove dead flowers during September and October to encourage more blooms.
Dividing: Every 3-4 years, divide the plant to maintain airflow and create new plants.
Overwintering: Asters are hardy in frost. Trim back after flowering in late autumn or spring, then add mulch if the soil is moist.
Light & Temperature: Asters need full sunlight for optimal growth. While they can tolerate partial sun, they will not thrive in deep shade. They prefer summer heat but do not do well in overly humid conditions.
When Do Asters Flower?
Aster amellus typically blooms from July to October. To protect the stems from wind damage, stake them with canes during the spring. Pinch back the tips of new shoots in late spring to encourage more flower production later in the season. Once the flowers begin to open, you can cut some stems to bring indoors as fresh cut flowers. Be sure to leave plenty of blooms in the garden to provide nectar for beneficial pollinators.
