How to Grow Australis
Wikimedia Commons
Australis
Alternanthera dentata
shrubAustralis is a colorful ornamental foliage plant known for its vibrant red, purple, and bronze leaf variegation. This tropical shrub is popular in gardens and aquascapes for its striking, pointed leaves that intensify in color with sunlight exposure. It's a heat-loving plant that thrives in warm, humid conditions.
When should you plant Australis in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Australis timeline · Pittsburgh, PA (Zone 6b)
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Plant Australis
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 Australis
Around May 17≈ 30 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Australis dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10b-11; grown as annual in cooler zones or indoors
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Get my Australis timeline →Growth Stages
Seedling
2-3 weeksSmall plants with initial green to reddish leaves emerging from soil; delicate appearance
Keep consistently warm (70-80°F) and moist. Provide bright indirect light. Protect from drafts and sudden temperature changes.
Vegetative
4-8 weeksRapid leaf growth with increasing color intensity; plant develops fuller, bushier shape with alternating leaf patterns
Increase light exposure to 6+ hours for vibrant coloration. Maintain consistent watering and fertilize every 2-3 weeks. Pinch growing tips to encourage bushiness.
Established Growth
Ongoing throughout growing seasonMature shrub with dense foliage and peak color expression; red, purple, and bronze coloration most pronounced
Continue regular watering and feeding. Prune to maintain shape and remove any leggy growth. Full sun exposure maintains best coloration.
Flowering
Several weeks, intermittentSmall, inconspicuous white or pale pink flower spikes appear between leaves; not the main ornamental feature
Flowers are negligible; deadheading is optional. Continue all regular care routines. Focus on foliage management.
Winter/Dormancy
3-4 monthsGrowth slows significantly in cooler zones; foliage may lose some vibrancy; plant enters rest period
Reduce watering frequency. Bring indoor plants to bright location. Reduce fertilizing. Maintain temperatures above 55°F if possible.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity, mist foliage, spray with neem oil or insecticidal soap every 7-10 days
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Remove with cotton swab dipped in rubbing alcohol; spray with insecticidal soap
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Prune affected areas; spray with horticultural oil or neem oil monthly
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Yellow sticky traps, insecticidal soap, or neem oil spray every 7 days
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and
Hand-pick; use Bt (Bacillus thuringiensis) or general insecticide if severe
Uses
Ornamental Foliage Display
HouseholdAustralis is prized as a colorful houseplant and garden accent plant for its striking red, purple, and bronze foliage. The intense coloration makes it ideal for container gardens, hanging baskets, and tropical-style landscapes. [source]
Aquarium and Aquascaping
CraftAlternanthera dentata 'Australis' is popular in aquascaping and paludarium setups, where it can be grown partially submerged. The vibrant foliage adds visual interest and the plant helps maintain water quality in planted aquariums. [source]
Garden Landscape Structure
WildlifeThe dense, colorful foliage provides shelter and visual contrast in tropical and subtropical gardens. Dense foliage can provide nesting material and insect habitat for beneficial arthropods. [source]
Indoor Tropical Accent
HouseholdWith bright indirect light and warm temperatures, Australis thrives as a colorful indoor plant. Its compact growth habit and vibrant coloring make it popular for plant collections and decorative arrangements. [source]
Harvest Tips
Australis is not harvested for food or traditional uses. Pinch or prune stems to encourage bushier growth and more vibrant foliage. Take cuttings 4-6 inches long in spring or summer for propagation; root in water or moist soil within 1-2 weeks.
Fun Facts
- 🌱 The coloration of Australis intensifies with exposure to sunlight and cooler nighttime temperatures; more sun exposure yields deeper red and purple hues.
- 🌱 Australis is the Latin word for 'southern,' referring to the plant's origin in southern regions; the full scientific name Alternanthera reflects its characteristic alternating leaf arrangement.
- 🌱 This plant can be easily propagated from cuttings placed in water, making it simple for gardeners to create multiple plants from a single parent plant.
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