Juni from Kyoto, Japan · CC BY 2.0
Tall fleabane
Plant·Aster ageratoides
Part sun
Sun
Medium
Water
Moist soil
Drainage
Zones 4–8
Hardiness
Tall fleabane (Aster ageratoides) is a plant. It grows best in sun to part shade and has moderate water needs.
Through the year
DormantLeafing outFloweringDying back
Works well with
from wiki dataNo companions recorded.
WHAT IT NEEDS
Wants part sun
Needs moderate water
Tolerates moist soil, as long as it drains well
Prefers soil pH 6–7.5
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Prefers loam, clay, sand soil
Tolerates some soil compaction
Draws up potassium, calcium from deep in the soil
Adds a moderate amount of organic matter to the soil
Partners with mycorrhizal fungi to boost nutrient uptake
WHAT IT GIVES
Gives nectar (abundant)
Gives pollen (abundant)
Gives habitat (shelter for beneficial insects)
Gives organic matter (medium biomass return)
Provides potassium
Provides calcium
Attracts pollinators
Attracts beneficial insects
HOW IT GROWS
SIZE & SPACING
Herbaceous
Height60–120 cm
Spacing45 cm (min 30 cm)
Root depthMedium
Width45–60 cm
Width figures are rough estimates, the most variable measurement in our data.
AI estimate · accuracy improves as growers contribute corrections.
HOW TO PROPAGATE
Propagate by seed, division
Difficulty
Establishes in about 1 yr
Self-seeds readily on its own
Where this comes from
Parsed22 Sept 2026
ConfidenceNot recorded
Photograph Juni from Kyoto, Japan · CC BY 2.0