Ageratum houstonianum

Flossflower

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Ageratum houstonianum (Flossflower) is a tender annual in the Asteraceae family, known for fuzzy blue/purple flower heads that attract pollinators. Note: Achillea is a distinct genus.
yard Outdoor plants wb_sunny Half-shade pets Not pet-safe
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Plant Details

Common Name Flossflower
Family Asteraceae
Genus Ageratum
Species Houstonianum
Origin Mexico / Central America
Blooming Summer to frost in warm climates, flowers year-round indoors with sufficient light
Leaf Color Medium green
Sunlight Half-shade
Category Outdoor plants
Pet Friendly close No
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Care & Maintenance

terrain
Soil

Well-draining potting mix with perlite or peat moss for aeration

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Watering

Keep soil consistently moist but not waterlogged. Allow top layer to dry slightly between waterings.

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Sunlight & Care

Full sun to partial shade. In summer heat, afternoon shade prevents scorching.

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Fertilization

Apply balanced liquid fertilizer every 2 weeks during active growing season (Spring/Summer)

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Pruning

Deadhead spent flowers regularly to promote continuous blooming and prevent self-seeding

Pest Control Aphid Thrip Whitefly

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 2 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 12 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
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Growing Parameters

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Temperature
59° – 90°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 75%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
5000 – 40000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
1200 – 3500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
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Soil Moisture
25% – 65%
% volumetric
Water content in the growing medium
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Soil EC
300 – 1800
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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