How to Grow Smilax excelsa
Smilax excelsa
Smilax excelsa
vineSmilax excelsa, commonly known as Sarsaparilla or Smilax, is a vigorous woody vine native to tropical and subtropical regions of the Americas. It produces small greenish flowers followed by red berries and is known for its thorny stems and heart-shaped leaves. The plant has long been used traditionally for medicinal purposes and as a flavoring agent.
When should you plant Smilax excelsa in your zone?
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Example Smilax excelsa timeline · Pittsburgh, PA (Zone 6b)
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Plant Smilax excelsa
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Smilax excelsa
Around Oct 14≈ 180 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Smilax excelsa dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10b-11, warm tropical to subtropical climates
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Get my Smilax excelsa timeline →Growth Stages
Establishment
4-8 weeksNew vine develops root system and initial shoots emerge from rhizomes or transplants
Keep soil consistently moist; provide support structure early; avoid disturbing rhizomes; mulch to retain moisture
Vegetative Growth
2-6 monthsVine develops climbing stems with heart-shaped leaves and characteristic thorns; rapid sprawling growth
Provide sturdy trellis or support structure; fertilize monthly with balanced fertilizer; prune to direct growth; maintain consistent moisture
Flowering
4-8 weeksSmall greenish-white flowers appear in clusters along stems
Reduce nitrogen fertilizer to encourage flowering; maintain adequate water and sunlight; do not overprune flowering shoots
Fruiting
6-10 weeksFlowers develop into small red berries that mature over several weeks
Continue regular watering; ensure adequate sunlight for berry development; protect from pests attracted to ripening fruit
Dormancy/Maturity
Ongoing in tropical climates; minimal dormancyVine may slow growth in cool months; established plants become woody and produce more vigorously
Reduce watering in dormant periods; prune back overgrown vines; divide rhizomes for propagation; maintain support structure
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use neem oil or insecticidal soap; improve humidity
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Remove with alcohol-soaked cotton swab; apply insecticidal soap; improve air circulation
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Prune heavily infested areas; apply dormant oil spray; use horticultural soap
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Remove affected leaves; improve air circulation; apply fungicide if severe; avoid overhead watering
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Hand-pick; use Bacillus thuringiensis (Bt) spray; encourage natural predators
Uses
Traditional tonic and anti-inflammatory
MedicinalThe roots have been used in traditional medicine for centuries as a general tonic, blood purifier, and to support joint health. Modern research suggests compounds in Smilax may have anti-inflammatory and antioxidant properties. [source]
Sarsaparilla beverage and flavoring
CulinaryThe roots are traditionally used to create sarsaparilla root beer and herbal beverages. The flavoring is warm, spicy, and slightly vanilla-like with anise notes. [source]
Skin health support
MedicinalTraditionally used to support skin conditions and overall dermatological health due to its purported blood-cleansing properties and high mineral content. [source]
Ornamental climbing structure coverage
HouseholdThe lush green foliage and vigorous growth make it excellent for covering trellises, arbors, and fences while providing textural interest with its thorny vines. [source]
Wildlife habitat and food source
WildlifeThe berries attract birds and other wildlife; the dense foliage provides shelter and nesting sites for beneficial creatures. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest roots/rhizomes in fall or spring for medicinal use, preferably from plants 3+ years old. Cut vines for fresh use anytime. Collect berries when fully red and ripe. For sarsaparilla root, carefully excavate rhizomes without destroying the plant; can be sustainably harvested by removing portions while leaving main rhizomes intact.
Fun Facts
- 🌱 Smilax excelsa is one of the original sources of sarsaparilla, which became a popular soft drink in America in the 1800s and was historically marketed as a medicinal tonic.
- 🌱 The plant's thorny stems serve as natural protection against grazing animals and intruders, making it traditionally used as a living fence in some regions.
- 🌱 The genus Smilax includes over 300 species found across tropical and subtropical regions worldwide, with many traditionally used in indigenous medicine systems.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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