Photo: Jay HornCC BY 4.0via iNaturalistresized / cropped
Sweet shrub Plant Care
Stenandrium dulce Nees
Updated · Sources · How we source care data
The Stenandrium dulce is easily recognized by its vibrant purple flowers with intricate patterns. Originating from Mexico, this plant is highly sought after by collectors for its unique blooms and ability to attract pollinators with its nectar-rich flowers.
Every 7–10 days
Bright indirect light
65–80°F
50–70%
At a glance
How do you care for Sweet shrub?
Water Sweet shrub every 7–10 days, letting the top layer of soil dry out between waterings, and give it bright indirect light. It prefers temperatures of 65–80°F (18–27°C) and 50–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Sweet shrub Native To?
What Is the Sweet shrub?
Sweet shrub (Stenandrium dulce) belongs to the Acanthaceae family within the Stenandrium genus. Sweet shrub is native to both North and South America. Sweet shrub is also known as sweet olive.
Sweet shrub displays an upright, clumping perennial growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Sweet shrub produces tubular flowers in shades of red, orange, or pink.
Leaf size: approximately 6 inches.
How Often Should You Water a Sweet shrub?
Stenandrium dulce 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 Sweet shrub Need?
Sweet shrub thrives in bright indirect light. Avoid placing Sweet shrub in direct, harsh sunlight for extended periods, as this can scorch the foliage.
Light Requirement
Bright indirect light
What Temperature and Humidity Does the Sweet shrub Prefer?
Stenandrium dulce grows best at temperatures of 65–80°F. Sweet shrub prefers humidity levels of 50–70%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
65–80°F
Humidity
50–70%
What Soil Mix Works Best for a Sweet shrub?
Well-draining soil with high organic content, such as a mix of peat moss, perlite, and compost. Good drainage is essential for Sweet shrub to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Sweet shrub?
Feed Sweet shrub 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 Sweet shrub?
Repot every 1-2 years in 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 Sweet shrub?
Sweet shrub can be propagated through stem cuttings, division of offsets. Similar propagation techniques also apply to stenandrium harlingii plant care, which shares the same genus.
Is the Sweet shrub Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Sweet shrub, 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 Sweet shrub?
Sweet shrub 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 Sweet shrub Need?
Sweet shrub grows outdoors in USDA Zone 8b – 11b. It survives winters down to planting zone 8b. Sweet shrub is native to both North and South America.
Hardiness Zone
Zone 8b – 11b
Keep exploring plants
Sweet shrub 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 Stenandrium genus — compare its care with other Stenandrium species on PlantoScan.
Stenandrium is part of the Acanthaceae plant family — browse all Acanthaceae genera and species.
Sweet shrub 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: Stenandrium dulce Nees, family Acanthaceae (first published in Prodr. 11: 282 (1847)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Sweet shrub, 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.
- Photo: Jay Horn, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 8b – 11b, estimated from the plant's typical growing conditions.
- 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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