Southeastern annual saltmarsh aster
Symphyotrichum squamatum · Asteraceae
The gardener's calendar
Ideal time to plant southeastern annual saltmarsh aster: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Alkali Marsh Aster
- Family
- Asteraceae
- Plant type
- Herbaceous perennial
- Blooming
- Autumn (September to November)
- Adult size
- 0.60 to 1.20 m in height
- Foliage
- Deciduous
- Hardiness
- Hardy to -15 °C
- Origin
- United States (west and southwest)
Care
Light exposure
Prefer a sunny location with at least 6 hours of direct sunlight per day. This plant blooms best in full sun, which also intensifies the color of its flowers. In partial shade, flowering will be less abundant.
Watering
Water regularly during the growth period, keeping the soil slightly moist but without waterlogging. In autumn, during flowering, reduce watering. In winter, the dormant plant needs very little water.
Soil
Plant in well-draining soil, ideally light and slightly sandy. This aster tolerates poor and even rocky soils, as long as they don't retain stagnant water.
Pruning and maintenance
Pinch back stems in spring to encourage a compact, bushy shape. After flowering, cut dry stems to ground level. Light cleaning of dead leaves keeps the plant healthy.
Fertilizer
Apply balanced fertilizer in spring when growth resumes. As autumn approaches, a fertilizer slightly enriched in potassium can support flowering. Avoid excess nitrogen, which would promote foliage at the expense of flowers.
Diseases and pests
This species is generally robust. Watch for powdery mildew in case of excessive humidity and poor air circulation. Good exposure and spacing between plants limit these problems. Aphids may occasionally visit: a water rinse is usually sufficient.
Did you know?
Asters of the Symphyotrichum genus have fascinated horticulturists since their introduction to Europe in the 17th century. The name "aster" means "star" in Greek, referring to the star-shaped flowers. Symphyotrichum squamatum, native to the American desert, has gradually become naturalized in Mediterranean gardens, where it blooms elegantly in autumn when few other plants dare to flower.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.