How to Grow Lantana 'Radiation'

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Lantana 'Radiation'

Lantana camara 'Radiation'

shrub

A vibrant cultivar of lantana featuring striking orange-red and yellow clustered flowers that bloom prolifically throughout the warm season. This tropical shrub is heat and drought-tolerant once established, making it ideal for hot climates and water-conscious gardens. It attracts butterflies and hummingbirds while requiring minimal maintenance.

Looking for a specific variety?

Cha Cha Heatwave Miss Huff Gold Mound Pink Caprice White Lantana

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Example Lantana 'Radiation' timeline · Pittsburgh, PA (Zone 6b)

Plant Lantana 'Radiation'
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Lantana 'Radiation'
Around Jun 16

≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Lantana 'Radiation' dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum; blooms best with maximum sunlight exposure

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Water: Water regularly during establishment and first growing season. Once established, very drought-tolerant; water deeply but infrequently. Reduce watering in winter. Overwatering causes root rot and reduces flowering.

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Spacing: 36 inches

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Days to maturity: 60-90 days to substantial flowering, 120-180 days for full mature size

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Planting depth: Plant transplants at soil level; seeds 1/4 inch deep

Soil

Type: Well-draining sandy loam or sandy soil

pH: 5.5-7.0

Amendments:

Perlite or coarse sand for drainage Compost for light fertility Avoid heavy clay and rich soil which promote foliage over flowers

Growing Zones

Find your zone →

Thrives in zones 8b-11; can be grown as an annual in zones 7-8a or brought indoors in winter

8b 9a 9b 10a 10b 11a 11b

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Growth Stages

Seedling

2-3 weeks

Small plants with opposite lanceolate leaves, typically 2-4 inches tall. True leaves appear after cotyledons.

Keep soil consistently moist but not waterlogged. Provide bright light and warm temperatures (70-75°F). Thin to prevent damping off.

Vegetative Growth

4-6 weeks

Rapid stem and leaf development, bushy structure forming. Plant reaches 12-24 inches with dense foliage, square stems characteristic of Verbenaceae family.

Pinch growing tips at 6-8 inches to encourage branching. Reduce watering as drainage improves. Begin feeding with balanced or slightly lower-nitrogen fertilizer.

Flowering Initiation

2-3 weeks

First flower clusters (called umbels) appear at branch tips. Flowers are tightly clustered in rounded heads, orange-red with yellow centers gradually intensifying in color.

Switch to higher-phosphorus fertilizer to support blooming. Maintain full sun exposure. Remove any damaged leaves. Consistent watering helps initial flower set.

Flowering & Fruiting

4-6 months during growing season

Continuous abundant flower clusters throughout warm months. As flowers fade, small drupe fruits develop (black when mature). Plant may reach 3-6 feet tall and equally wide.

Deadhead spent flowers to encourage continuous blooming (though not essential). Reduce fertilizer frequency. Water only during drought. Watch for spider mites in hot, dry conditions.

Dormancy/Winter Rest

2-4 months

In frost-prone zones, plant dies back or loses foliage; in frost-free zones, growth slows. Stems may brown; plant appearance becomes sparse.

In zones 8-9, prune back by one-third to one-half after first frost to promote spring regrowth. Reduce watering significantly. In zones 10+, minimal intervention needed. Move container plants indoors in cold zones.

Companion Planting

Plan your garden →

Plant with:

Salvia greggii Esperanza (Tecoma stans) Desert marigold Angelita daisy Purple heart (Tradescantia pallida) Lantana 'Heatwave' (other Lantana varieties) Black-eyed Susan Winecups (Callirhoe) Russian sage (Perovskia) Sedums and other drought-tolerant perennials

Avoid planting near:

Plants requiring consistent moisture (hostas, ferns, hydrangeas) Shade-preferring plants (would be outcompeted and shaded) Plants sensitive to root competition in poor soil conditions

Common Pests

Increase humidity via misting; spray with water to dislodge; use miticides if severe; avoid stress from drought and high heat
Yellow sticky traps; spray with insecticidal soap; spray undersides of leaves where nymphs cluster; reflective mulch
Hand-remove or use horticultural oil spray in early spring before new growth; prune heavily infested branches
Improve air circulation; avoid overhead watering; spray with sulfur or fungicide if necessary; remove affected foliage
Spray with insecticidal soap; encourage beneficial predators; remove heavily infested leaves; rarely fatal

Uses

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Pollinator Magnet

Wildlife

Lantana 'Radiation' is renowned for attracting butterflies, hummingbirds, and other pollinators. The clustered flowers provide abundant nectar and serve as a vital food source during migration seasons. [source]

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Herbal Tea & Remedies

Culinary

In traditional medicine, particularly in Central and South America where lantana is native, leaves and flowers are brewed into tea claimed to have anti-inflammatory and digestive benefits. Use only organically grown plants without pesticides. [source]

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Ornamental Landscape & Container Gardening

Household

The vibrant orange-red and yellow flowers make 'Radiation' a striking focal point in hot landscapes, borders, and containers. Its compact, bushy form and long blooming season provide color from spring through first frost. [source]

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Cut Flower & Floral Arrangements

Craft

The colorful clustered flower heads can be cut for fresh or dried arrangements. Dried lantana flowers retain their vibrant color and distinctive form, making them popular for decorative purposes. [source]

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Traditional Anti-inflammatory Use

Medicinal

Caribbean and Latin American traditional medicine uses lantana leaf preparations topically for wounds and internally for fever and inflammation, though clinical evidence is limited. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Lantana 'Radiation' is not harvested in the traditional sense. Deadhead spent flower clusters to promote continuous blooming throughout the season. Cut flowers last 1-2 weeks in arrangements if desired. Allow some flowers to remain on mature plants to develop seeds for wildlife food or self-seeding.

Fun Facts

🌱 Lantana 'Radiation' flowers change color as they age—starting yellow with orange-red edges and becoming progressively redder—a phenomenon called 'color flirtation' that attracts different pollinator species throughout the day.
🌱 Lantana is native to tropical regions of the Americas but has naturalized in warm climates worldwide, sometimes becoming invasive in places like Australia and South Africa due to its prolific seed production and ability to thrive in harsh conditions.
🌱 The name 'Radiation' perfectly describes how the bicolor flowers seem to radiate from the flower head center, and the plant's ability to thrive in intense heat and full-sun conditions where other plants wilt.

Gardening Terms

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

Cultivar Damping Off Deadhead Full Sun pH True Leaves

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