Hayfield Tarweed
Hemizonia congesta subsp. lutescens
Care
full sun
low
0–2ft tall
Jan-Dec
Friendly
Prized
Coastal grassland and scrub from the San Francisco Bay Area to Santa Barbara County, below 2000 ft elevation
Care Guide
Planting
Plant Hayfield Tarweed in full sun in well-draining soil during the winter or spring months, mimicking its natural habitat in California grasslands and open areas. Space plants to accommodate their spindly growth habit, which typically reaches 1 to 2.5 feet tall. This is an annual herb, so plan for seasonal growth rather than a permanent fixture in your garden.
After Planting
Water minimally after planting - this is a low-water plant adapted to natural rainfall patterns, so avoid overwatering once established. Expect blooms from winter through spring as the plant flowers and sets seed. The most common mistake is treating this like a perennial or watering it as heavily as other garden plants; let it thrive on lean conditions and allow it to self-seed if you want it to return the following year.
Endangered & Threatened Species Supported
California state threatened species
California CESA Candidate species
Wildlife Supported
Birds
Critical seed source during fall and winter months for overwintering birds
Insects
Specialized pollen collector on Hemizonia species
Parasitic plant utilizing Hemizonia as host plant
Endemic California species utilizing native plant nectar
Adult butterflies nectar on flowers; important migrant resource
Skipper butterfly utilizing floral nectar
Mammals
Harvests and caches seeds for winter food storage