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Symphyotrichum subulatum
annual saltmarsh aster
Symphyotrichum subulatum
Symphyotrichum subulatum, also known as the annual saltmarsh aster, is a slender annual or biennial plant with small, daisy-like flowers that are typically white to light purple. It thrives in moist, saline environments such as salt marshes, coastal areas, and disturbed sites. Its ability to tolerate salty conditions makes it a notable species in coastal ecosystems.
CategoryDetails
Estimated Plant Lifespan1 year lifespan
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: animal

Notes: Primarily pollinated by insects, especially bees and butterflies.

Watering Requirements

Method: top water

Frequency: Keep soil consistently moist, especially during dry periods.

Notes: Tolerates saline conditions, so watering with slightly salty water is acceptable.

Humidity Requirements

Level: moderate

Cleaning RequirementsDeadhead spent flowers to encourage continued blooming and prevent excessive self-seeding. May require support in windy areas to prevent flopping.
Temperature Range

Min: -5°C

Max: 35°C

Sporobolus alterniflorus
Saltmarsh Cordgrass
Sporobolus alterniflorus
Both species thrive in similar saline environments and can coexist, contributing to habitat complexity and stability.
Iva frutescens
marsh elder
Iva frutescens
Marsh Elder shares similar habitat preferences and can offer structural diversity in salt marsh ecosystems where Symphyotrichum subulatum grows.
Phragmites australis
common reed
Phragmites australis

Phragmites australis can outcompete Symphyotrichum subulatum for resources due to its aggressive growth and dense stands, limiting the aster's access to sunlight and nutrients.

Typha latifolia
broadleaf cattail
Typha latifolia

Cattails can aggressively spread and shade out smaller plants like Symphyotrichum subulatum, reducing their access to sunlight and space.

Aphids

Aphids are small, sap-sucking insects that can weaken plants by feeding on their foliage. Infestations may result in stunted growth, leaf curling, and the secretion of honeydew, which can attract sooty mold.

Spider Mites

Spider mites are tiny pests that suck sap from plant leaves, causing a stippled or bronzed appearance. Heavy infestations can lead to leaf drop and overall plant decline.

Steps:

    • Collect seeds from mature plants in the fall.
    • Direct sow seeds in early spring after the last frost, or start indoors 6-8 weeks before the last frost.
    • Press seeds lightly into the soil surface and keep moist until germination.
    • Transplant seedlings outdoors once they are large enough to handle, spacing them appropriately.

Neem Oil

Effective natural insecticide for controlling aphids and spider mites.

Diatomaceous Earth

Natural pest control option that can be sprinkled around plants to deter crawling insects.