Garrettia siamensis Plant Care
Garrettia siamensis H.R.Fletcher
Updated · Sources · How we source care data
Rokohia siamensis is a species of flowering plant in the family Lamiaceae. It a shrub or tree native to southern China and northern Thailand.
Every 7–10 days
Full sun to partial shade
60–80°F
40–70%
At a glance
How do you care for Garrettia siamensis?
Water Garrettia siamensis every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 60–80°F (16–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
What Is the Garrettia siamensis?
Garrettia siamensis (Garrettia siamensis) belongs to the Lamiaceae family within the Garrettia genus. Garrettia siamensis is native to southern China and northern Thailand.
Garrettia siamensis displays a spreading herbaceous perennial growth habit, reaching up to 1.5 ft tall with a spread of approximately 2 ft. Garrettia siamensis produces small tubular purple flowers in dense spikes.
Leaf size: approximately 2 inches.
How Often Should You Water a Garrettia siamensis?
Garrettia siamensis requires watering every 7–10 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 7–10 days
Let soil partially dry between waterings
What Light Does the Garrettia siamensis Need?
Garrettia siamensis thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Garrettia siamensis Prefer?
Garrettia siamensis grows best at temperatures of 60–80°F. Garrettia siamensis prefers humidity levels of 40–70%.
Temperature
60–80°F
Humidity
40–70%
What Soil Mix Works Best for a Garrettia siamensis?
Well-draining sandy loam with added organic matter for moisture retention. Good drainage is essential for Garrettia siamensis to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Garrettia siamensis?
Feed Garrettia siamensis 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 Garrettia siamensis?
Repot every 1-2 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 Garrettia siamensis?
Garrettia siamensis can be propagated through softwood cuttings, division of root ball.
Is the Garrettia siamensis Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Garrettia siamensis, 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 Garrettia siamensis?
Garrettia siamensis is susceptible to aphids, spider mites, whiteflies. 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 Garrettia siamensis Need?
Garrettia siamensis grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Garrettia siamensis is native to southern China and northern Thailand. In cooler regions, grow Garrettia siamensis as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Garrettia siamensis 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 Garrettia genus — compare its care with other Garrettia species on PlantoScan.
Garrettia is part of the Lamiaceae plant family — browse all Lamiaceae genera and species.
Garrettia siamensis 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: Garrettia siamensis H.R.Fletcher, family Lamiaceae (first published in Bull. Misc. Inform. Kew 1937: 71 (1937)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Garrettia siamensis, 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 13a, 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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