BLOOMING SYMPHYOTRICHUM CORDIFOLIUM

Phonetic:  sim-fy-oh-TRY-kum kor-dih-FOH-lee-um

Delicate, light blue-lavender flowers with pink centers are borne in large clusters above distinctive heart-shaped leaves in late summer. Heart Leaved Aster is perfect for extending color and interest in the woodland shade garden, well into autumn. Spreads slowly by rhizome to form a nice patch.

• Hardiness:  3 - 9
• Native Region: BONAP Map
• BONAP Map Key Color Guide: Map Color Key
• Sun Exposure:  Part Sun to Part Shade
• Flower Color:  Blue
• Bloom Time:  September, October
• Soil Type:  Medium, Medium - Dry
• Mature Plant Size:  3'H x 2W'
• Plant Spacing:  18" - 24"
• Host Plant: Pearl Crescent, Silvery Checkerspot
• Attracts: Bees, Butterflies
• Advantages: Deer resistant, drought tolerant
• Landscape Uses: Cottage garden, butterfly garden, woodland garden, cut flower garden
• Companion Plants: Sweet Joe Pye Weed, Sweet Goldenrod, Fringed Bleeding Heart, Woodland Phlox, Foam Flower, Wild Geranium, Northern Blue Flag, Garden Phlox

Why Symphyotrichum cordifolium is Valuable for Fall Pollinators

As summer flowers begin to fade, Symphyotrichum cordifolium becomes an important source of nectar and pollen for many native pollinators. Late-season blooms help sustain bees that are preparing for winter while also providing fuel for butterflies that remain active into autumn. Because this species flowers when floral resources are becoming scarce, it helps support a healthier garden ecosystem during a critical time of year.

Planting native perennials with staggered bloom times creates a more dependable food source across the growing season, benefiting wildlife long after spring flowers have disappeared. At Bagley Pond Perennials, we believe every planting can contribute to stronger habitats while adding lasting beauty to your landscape.

How Heart-Leaved Aster Changes Throughout the Seasons

• Spring: Fresh, heart-shaped foliage emerges to create an attractive woodland ground layer.
• Summer: Upright stems develop gradually, adding texture and blending naturally with neighboring native plants.
• Late Summer Into Fall: Airy clusters of soft blue-lavender flowers brighten shaded spaces while attracting a variety of pollinators.
• Winter: Seed heads provide subtle seasonal interest and may offer food for birds before new growth begins the following spring.

Planning to create a garden that supports wildlife from spring through fall? Our team is here to help. Contact us today to get started!

Frequently Asked Questions

Can Symphyotrichum cordifolium grow in established woodland gardens?

Yes. Its natural preference for part shade makes it an excellent choice beneath open tree canopies or along woodland edges, where it complements other shade-loving native perennials without overwhelming nearby plants.

Does Symphyotrichum cordifolium attract pollinators throughout its bloom period?

Yes. As its flowers continue opening over several weeks, Symphyotrichum cordifolium provides a dependable source of nectar and pollen for a wide range of native bees and other beneficial insects. The extended bloom period helps support pollinators when many other flowering plants have already finished for the season.

Is Symphyotrichum cordifolium suitable for naturalized landscapes?

Yes. Symphyotrichum cordifolium is well-suited to naturalized landscapes because of its gradual spreading habit and ability to establish attractive colonies without becoming overly aggressive. It works beautifully along woodland edges, in meadow transitions, beneath open tree canopies, or within informal native plantings where it can weave naturally among other native perennials. As the plants mature, they create a soft, layered appearance that complements more structured garden designs while also enhancing habitat value.

Does Symphyotrichum cordifolium require rich soil to thrive?

No. Symphyotrichum cordifolium is adaptable to a variety of average garden soils, provided they offer good drainage and appropriate moisture. Once established, it can grow even in less-than-ideal conditions, making it a practical option for gardeners who want to expand their collection of native perennials without making significant soil amendments.