Hayfield tarweed (Hemizonia congesta)

Hayfield tarweed

Also known as: Yellow hayfield tarplant, Mendocino tarplant, Pale-yellow hayfield tarplant

Hemizonia congesta is commonly called the hayfield tarweed and is native to western North America. This flowering plant has many subspecies of different appearances, making it hard to distinguish.

Scientific classification

Species

Hayfield tarweed (Hemizonia congesta)

Asters bellflowers fanflowers and allies

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Annual

Lifespan

10 cm to 80 cm

Plant Height

30 cm

Spread

1.5 cm to 3.5 cm

Flower Size

White, Yellow

Flower Color

Semi-evergreen

Leaf type

Images of Hayfield tarweed

Care Guide for Hayfield tarweed

Every week

Water

Full sun

Sunlight

Water: Hayfield tarweed, originating from dry grasslands, thrives with moderate watering, requiring weekly hydration. It is well-suited for xeriscaping due to its drought resilience, making it ideal for outdoor cultivation in similar climates with intermittent moisture.

Fertilize: For hayfield tarweed, use balanced fertilizers for optimal growth. Start with high-nitrogen early, then switch to balanced during flowering. Fertilize monthly when active, less in dormancy. Water soil prior to application and avoid over-fertilization to prevent root burn. Wear gloves for safety.

Pruning: Hayfield tarweed features aromatic leaves and bright yellow flowers. Prune in early to late spring, removing dead stems to boost air circulation and health. Regular pruning encourages vigor, manages growth, prevents disease, and enhances its dense, attractive appearance.

Propagation: To propagate hayfield tarweed, prepare a well-draining soil mix and surface sow the seeds, as light is needed for germination. Maintain moisture without waterlogging and provide bright, indirect light. Once seedlings have true leaves, transplant to individual pots or a garden area, ensuring ample sunlight and space.

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