How to Grow Imperial Bronze
Wikimedia Commons
Imperial Bronze
Ocimum basilicum 'Imperial Bronze'
herbImperial Bronze is a striking basil variety featuring deep purple-bronze foliage with a compact, bushy growth habit. It offers a rich, slightly spicy basil flavor with subtle licorice notes, making it both ornamental and culinary. This cultivar is prized for its dramatic color and excellent flavor in cooking and garnishing.
When should you plant Imperial Bronze 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 Imperial Bronze timeline · Pittsburgh, PA (Zone 6b)
-
Plant Imperial Bronze
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Imperial Bronze
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Imperial Bronze dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-10; grow as an annual in cooler zones or bring indoors before frost
Sign up free to see if Imperial Bronze grows in your zone — and get a personalized planting timeline.
Get my Imperial Bronze timeline →Growth Stages
Seedling
2-3 weeksTiny purple-tinged cotyledons emerge; true leaves develop with characteristic basil shape and bronze coloring becoming apparent
Keep soil warm (70-75°F) and consistently moist; provide bright light; thin seedlings to prevent crowding
Vegetative
3-4 weeksPlant develops multiple stems with increasingly prominent deep purple-bronze leaves; compact, bushy form takes shape
Pinch off flower buds and top 0.5 inches of stems weekly to encourage bushiness; maintain consistent moisture and warmth
Pre-flowering
2-3 weeksPlant reaches full size with dense foliage; flower buds begin forming at stem tips; color deepens to rich bronze
Continue pinching buds to extend leaf production; fertilize lightly every 2-3 weeks with balanced fertilizer
Flowering
Variable; 2-4 weeks per flushSmall purple-white flowers appear in terminal spikes; if allowed to flower, leaf quality and flavor may decline slightly
Remove flower spikes promptly unless saving seeds; harvesting flowers is acceptable for culinary use
Mature/Harvest
4-8 weeks until first frostPlant is full and bushy with abundant harvestable foliage; maintains vigor with regular pinching and harvesting
Harvest regularly to maintain shape and productivity; remove outer leaves first; plant will continue producing until frost
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Handpick in early morning; use neem oil or spinosad spray; encourage natural predators
-
Increase humidity with misting; spray with water to dislodge; use neem oil or insecticidal soap if severe
-
Use yellow sticky traps; spray undersides of leaves with insecticidal soap or neem oil; encourage beneficial insects
-
Spray with strong water stream; use insecticidal soap; apply neem oil; introduce ladybugs
-
and
Remove by hand, especially at night; use beer traps or copper barriers; encourage ground beetles
Uses
Fresh cooking and pesto
CulinaryImperial Bronze's deep, spicy-sweet basil flavor makes it exceptional in pesto, pasta sauces, and Italian dishes. The dramatic purple-bronze color adds visual appeal to fresh salads, pizza, and cooked dishes. [source]
Infusions and beverages
CulinaryFresh leaves steep beautifully for basil tea or herbal infusions. The flavor is bold enough for cocktails and mocktails, adding complexity and visual intrigue. [source]
Digestive and anti-inflammatory support
MedicinalBasil contains volatile oils including linalool and eugenol with potential anti-inflammatory and digestive benefits. Traditionally used in herbal medicine to support digestion and reduce gas. [source]
Ornamental kitchen garden accent
HouseholdThe striking purple-bronze foliage makes Imperial Bronze an attractive addition to container gardens, window boxes, and ornamental kitchen beds. It adds color and texture while providing fresh herb harvests. [source]
Botanical arrangements and drying
CraftThe colorful foliage and flower spikes dry well for arrangements and craft projects. Fresh sprigs add visual interest to flower bouquets and table settings. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting when plant has 6-8 leaves; pinch off top 0.5-1 inch of stems regularly to encourage bushiness. Remove leaves from the top down. For best flavor, harvest in early morning after dew dries. Continuous harvesting promotes more leaf production. Remove flower buds as they appear to extend the harvest season. Plant remains productive until first frost.
Fun Facts
- 🌱 Imperial Bronze basil's deep purple coloring comes from anthocyanin pigments, the same compounds that give blueberries and red wine their health-promoting properties.
- 🌱 Basil is highly aromatic because it produces volatile essential oils that intensify in hot, sunny conditions—pinching and harvesting actually triggers the plant to produce more of these flavorful oils.
- 🌱 In traditional Italian cuisine, basil is considered so important that growing it was believed to be a sign of a woman's readiness for marriage and commitment.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Imperial Bronze planting timeline
Tell us your zip code and we'll calculate exactly when to start Imperial Bronze seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Imperial Bronze timeline →