False rosinweed (Osmadenia tenella)

False rosinweed

Also known as: Osmadenia

It is an annual herb that is named 'False rosinweed' for its resemblance to rosinweed (Silphium integrifolium). You can only find false rosinweed (Osmadenia tenella) growing in rocky soils, scrubs, and coastal grasslands in its native California and Baja California. Look out for its white flowers in early summer.

Scientific classification

Species

False rosinweed (Osmadenia tenella)

Asters bellflowers fanflowers and allies

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Annual

Lifespan

41 cm

Plant Height

White, Purple

Flower Color

Semi-evergreen

Leaf type

Images of False rosinweed

Distribution of False rosinweed

Distribution Map

False rosinweed is a plant inherently native to the central part of the North American continent. Although detailed regional distribution within this continent is not specified, the plant is traditionally found in temperate zones. Its presence beyond its native range due to cultivation or naturalization is not explicitly documented.

Native

Cultivated

Invasive

Introduced

No species reported

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Hemisphere Trend Curve

Northern

Sorthern

Care Guide for False rosinweed

Every week

Water

Full sun

Sunlight

Water: Originating from moderately moist environments, false rosinweed thrives with a balanced water regimen, preferring consistent humidity without being waterlogged. Water weekly for optimal growth, typically outdoors to benefit from natural rainfall while avoiding over-saturation, making it a resilient choice for predictable hydration needs.

Fertilize: For optimal growth, false rosinweed requires balanced nutrition fertilizer during its growing season, switching to high-nitrogen pre-flowering. Fertilize monthly and reduce during dormancy. Water post-fertilization to prevent root burn, ensuring soil enrichment for enhanced health, vigor, and blooms.

Pruning: False rosinweed features delicate, daisy-like flowers and benefits from regular pruning in early to late spring. This promotes new growth, enhances air circulation, and encourages vigorous flowering while reducing pests. Use clean tools and water afterward to support healthy regrowth.

Propagation: False rosinweed is propagated by careful seed collection and sowing in well-drained, moisture-retaining soil. Grow in sunny locations and use balanced fertilizer for early growth. Regularly monitor soil moisture and sunlight for healthy development.

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