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How to Grow Ruby Glow

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Ruby Glow

Alternanthera dentata 'Ruby Glow'

shrub

Ruby Glow is a striking ornamental foliage plant prized for its deep burgundy to crimson leaves that intensify in color with bright light. This tender perennial shrub is commonly grown as an annual in cooler climates and works well in containers, borders, and as a houseplant. Its compact, bushy growth habit and vibrant red-toned foliage make it a popular choice for adding bold color accents to gardens.

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Example Ruby Glow timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Ruby Glow

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Ruby Glow

    Around May 17

    ≈ 30 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Ruby Glow dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily (more sunlight intensifies leaf color)
💧
Water: Keep soil consistently moist but not waterlogged; water when top inch of soil dries out; reduce watering in winter. Prefers high humidity.
📏
Spacing: 12-18 inches
📅
Days to maturity: 30-45 days to reach ornamental size
🌱
Planting depth: Seeds: 1/4 inch deep; transplants: plant at same depth as container

Soil

Type: Well-draining loamy soil, slightly fertile
pH: 6.0-7.0
Amendments:
Peat moss or coco coir Perlite for drainage Compost or balanced slow-release fertilizer

Growing Zones

Find your zone →

Zones 10-12; grows as annual in zones 3-9 or indoors year-round

10b 11 12

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Growth Stages

1

Seedling

2-3 weeks

Tiny seedlings with first true leaves appearing; leaves initially green before burgundy coloration develops

Keep soil warm (70-75°F) and consistently moist; provide bright indirect light; thin seedlings when 2-3 inches tall

2

Vegetative Growth

3-6 weeks

Plant develops branching structure with increasingly burgundy-tinted foliage; bushy form taking shape

Pinch back growing tips every 2-3 weeks to encourage bushiness; gradually expose to brighter light; begin feeding with diluted fertilizer

3

Color Development

4-8 weeks

Foliage deepens to rich ruby and crimson tones; plant reaches desired ornamental size with full bushy appearance

Maximize sunlight exposure for deepest color; continue pinching to maintain shape; fertilize every 2 weeks with balanced liquid fertilizer

4

Mature Ornamental

Continuous while growing

Full-sized plant with vibrant deep burgundy leaves; compact, dense mounding form

Maintain regular watering and humidity; deadhead tiny inconspicuous flowers if desired; pinch occasionally to prevent legginess

5

Overwintering (in zones 3-9)

4-6 months

Plant can be brought indoors before frost or kept as annual and replanted next season

Reduce watering and feeding; provide bright indoor light; can be stored in cool dormancy (50-60°F) with minimal water

Companion Planting

Plan your garden →

Plant with:

Dusty Miller Coleus Begonias Impatiens Caladiums Sweet Potato Vine Marigolds

Avoid planting near:

Allelopathic plants (black walnut, eucalyptus) Dense shade trees that compete for light

Common Pests

  • Increase humidity with frequent misting; spray with water to dislodge; use insecticidal soap or neem oil if severe

  • Inspect regularly; remove with alcohol-soaked cotton swab; apply neem oil or insecticidal soap

  • Spray with strong water stream; apply insecticidal soap or neem oil; encourage beneficial insects

  • Use yellow sticky traps; spray undersides of leaves with neem oil or insecticidal soap

Uses

🍳

Edible Ornamental Garnish

Culinary

Some Alternanthera species are edible; Ruby Glow leaves can be used sparingly as a colorful garnish for salads and plates. Verify plant-specific cultivar safety before consuming. [source]

🏠

Interior Container Gardening

Household

Ruby Glow thrives as an indoor houseplant in bright locations, adding striking color to living spaces, offices, and conservatories year-round. [source]

🎨

Floral Arrangements & Display

Craft

The vibrant burgundy foliage is excellent for cut flower arrangements, wreaths, and decorative displays, adding rich color and texture. [source]

🦋

Garden Pollinator Support

Wildlife

While grown primarily for foliage, Ruby Glow produces tiny flowers that attract small pollinators and beneficial insects to garden spaces. [source]

Harvest Tips

Ruby Glow is grown for foliage, not harvest; pinch off growing tips regularly to encourage bushier growth and maintain shape. Stem cuttings can be taken year-round for propagation.

Fun Facts

  • 🌱 Ruby Glow is a cultivar of Alternanthera dentata, a tropical plant native to South America, and the intense burgundy color develops in response to high light exposure and can fade to green in low light.
  • 🌱 The plant's coloring is enhanced by anthocyanin pigments that increase under UV light stress, making it useful for understanding plant physiology in educational settings.
  • 🌱 Ruby Glow is popular in aquascaping and paludarium setups because some Alternanthera species thrive in semi-aquatic conditions, though this particular cultivar is best in terrestrial gardens.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Annual Deadhead Full Sun Perennial Pinch Back True Leaves
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