Lomatium repostum Plant Care
Lomatium repostum (Jeps.) Mathias
Updated · Sources · How we source care data
Lomatium repostum is an uncommon species of flowering plant in the carrot family known by the common name Napa biscuitroot, or Napa lomatium. It is endemic to California, where it is known only from the northrthern California Coast Ranges surrounding the northern San Francisco Bay Area.
Every 7–14 days
Full sun to partial shade
50–80°F
40–60%
At a glance
How do you care for Lomatium repostum?
Water Lomatium repostum 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 40–60% humidity. Fertilize it every 6 months during the growing season.
Where Is the Lomatium repostum Native To?
What Is the Lomatium repostum?
Lomatium repostum (Lomatium repostum) belongs to the Apiaceae family within the Lomatium genus. Lomatium repostum is native to California.
Lomatium repostum displays a clumping perennial herb growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Lomatium repostum produces small clusters of yellow flowers in umbels.
Leaf size: approximately 4 inches.
How Often Should You Water a Lomatium repostum?
Lomatium repostum 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 Lomatium repostum Need?
Lomatium repostum thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Lomatium repostum Prefer?
Lomatium repostum grows best at temperatures of 50–80°F. Lomatium repostum prefers humidity levels of 40–60%.
Temperature
50–80°F
Humidity
40–60%
What Soil Mix Works Best for a Lomatium repostum?
Well-draining sandy soil with good organic content. Good drainage is essential for Lomatium repostum to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Lomatium repostum?
Feed Lomatium repostum 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 Lomatium repostum?
Repot every 2-3 years in early spring. 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 Lomatium repostum?
Lomatium repostum can be propagated through seeds, division of roots. Similar propagation techniques also apply to lomatium plant care, which shares the same genus.
Is the Lomatium repostum Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Lomatium repostum, 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 Lomatium repostum?
Lomatium repostum is susceptible to aphids, spider mites, powdery mildew. 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 Lomatium repostum Need?
Lomatium repostum grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Lomatium repostum is native to California. In cooler regions, grow Lomatium repostum as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Lomatium repostum 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 Lomatium genus — compare its care with other Lomatium species on PlantoScan.
Lomatium is part of the Apiaceae plant family — browse all Apiaceae genera and species.
Lomatium repostum thrives in bright light and direct sun — see other bright-light plants.
More Lomatium Species
Other Lomatium species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Lomatium repostum (Jeps.) Mathias, family Apiaceae (first published in Ann. Missouri Bot. Gard. 25: 237 (1938 publ. 1937)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Lomatium repostum, 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.
Identify Plants Like the
Lomatium repostum Instantly
Scan any plant with your phone camera and get instant ID, care tips, water and fertilizer reminders, and health checks — all in one app.
Free
to download
iOS & Android
platforms
Light & dark
mode
100,000+
species