Thornmint Plant Care
Acanthomintha ilicifolia A.Gray
Updated · Sources · How we source care data
Acanthomintha ilicifolia, known by the common name San Diego thornmint, is a rare species of flowering plant in the mint family. It is native to Baja California and San Diego County, California, where it is a resident of the chaparral and coastal sage scrub plant communities and vernal pools.
Full sun to partial shade
At a glance
How do you care for Thornmint?
Plant Thornmint in full sun to partial shade.
Where Is the Thornmint Native To?
What Is the Thornmint?
Thornmint (Acanthomintha ilicifolia) belongs to the Lamiaceae family within the Acanthomintha genus. Thornmint is native to Baja California and San Diego County, California. Thornmint is also known as California Mint.
Thornmint displays a low spreading groundcover growth habit, reaching up to tall with a spread of approximately . Thornmint produces small tubular flowers in shades of pink, purple, or white.
What Light Does the Thornmint Need?
Thornmint thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Soil Mix Works Best for a Thornmint?
Well-draining sandy soil mix with some organic matter. Good drainage is essential for Thornmint to prevent waterlogging, which leads to root rot and fungal issues.
Where Should You Plant a Thornmint?
Choose a spot with full sun to partial shade and well-draining sandy soil mix with some organic matter. Avoid low spots where water collects after rain.
Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.
How Do You Prune a Thornmint?
Prune Thornmint while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.
If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.
How Do You Care for a Thornmint in Winter?
Water deeply in late autumn before the ground freezes, and spread a 5–8 cm (2–3 in) layer of mulch over the root zone, keeping it away from the trunk.
Young and container-grown shrubs need extra protection: roots in a pot freeze much more easily than roots in the ground.
How Do You Propagate a Thornmint?
Thornmint can be propagated through seeds, stem cuttings. Similar propagation techniques also apply to dutton's mint plant care, which shares the same genus.
Is the Thornmint Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Thornmint, 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 Thornmint?
Thornmint is susceptible to aphids, spider mites. 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.
Keep exploring plants
Thornmint 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 Acanthomintha genus — compare its care with other Acanthomintha species on PlantoScan.
Acanthomintha is part of the Lamiaceae plant family — browse all Lamiaceae genera and species.
Thornmint thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Acanthomintha ilicifolia A.Gray, family Lamiaceae (first published in Syn. Fl. N. Amer. 2(1): 365 (1878)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Thornmint, 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.
- 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
Thornmint 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