Threadleaf Brodiaea Plant Care
Brodiaea filifolia S.Watson
Updated · Sources · How we source care data
Brodiaea filifolia, known by the common name thread-leaved brodiaea, is a rare species of flowering plant in the cluster-lily genus. It is endemic to southern California, mostly in the region around the junction of Orange, Riverside, and San Diego Counties.
Every 7–14 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Threadleaf Brodiaea?
Water Threadleaf Brodiaea every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Threadleaf Brodiaea Native To?
What Is the Threadleaf Brodiaea?
Threadleaf Brodiaea (Brodiaea filifolia) belongs to the Asparagaceae family within the Brodiaea genus. Threadleaf Brodiaea is native to southern California, mostly in the region around the junction of Orange, Riverside, and San Diego Counties. Threadleaf Brodiaea is also known as Ithuriel's Spear.
Threadleaf Brodiaea displays a clumping perennial growth habit, reaching up to 1 ft tall with a spread of approximately 0.5 ft. Threadleaf Brodiaea produces showy clusters of funnel-shaped flowers in shades of blue, purple, or white.
Leaf size: approximately 12 inches.
How Often Should You Water a Threadleaf Brodiaea?
Brodiaea filifolia requires watering every 7–14 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–14 days
Let soil partially dry between waterings
What Light Does the Threadleaf Brodiaea Need?
Threadleaf Brodiaea thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Threadleaf Brodiaea Prefer?
Brodiaea filifolia grows best at temperatures of 50–80°F. Threadleaf Brodiaea prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Threadleaf Brodiaea?
Well-draining sandy loam with added organic matter. Good drainage is essential for Threadleaf Brodiaea to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Threadleaf Brodiaea?
Feed Threadleaf Brodiaea every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Threadleaf Brodiaea?
Divide and repot every 2-3 years. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Threadleaf Brodiaea?
Threadleaf Brodiaea can be propagated through offsets, seeds. Similar propagation techniques also apply to brodiaea appendiculata plant care, which shares the same genus.
Is the Threadleaf Brodiaea Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Threadleaf Brodiaea, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Threadleaf Brodiaea?
Threadleaf Brodiaea is susceptible to aphids, snails, slugs. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Threadleaf Brodiaea Need?
Threadleaf Brodiaea grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Threadleaf Brodiaea is native to southern California, mostly in the region around the junction of Orange, Riverside, and San Diego Counties. In cooler regions, grow Threadleaf Brodiaea as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Threadleaf Brodiaea is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Brodiaea genus — compare its care with other Brodiaea species on PlantoScan.
Brodiaea is part of the Asparagaceae plant family — browse all Asparagaceae genera and species.
Threadleaf Brodiaea thrives in bright light and direct sun — see other bright-light plants.
More Brodiaea Species
Other Brodiaea species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Brodiaea filifolia S.Watson, family Asparagaceae (first published in Proc. Amer. Acad. Arts 17: 381 (1882)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Threadleaf Brodiaea, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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