How to Grow Crystal Palace Lobelia
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Crystal Palace Lobelia
Lobelia erinus 'Crystal Palace'
flowerCrystal Palace is a compact, mounding annual lobelia featuring deep blue flowers with dark foliage, creating stunning visual contrast. This dwarf variety reaches only 4-6 inches tall and spreads 6-12 inches, making it ideal for borders, containers, and hanging baskets. It blooms prolifically from late spring through fall with minimal deadheading required.
When should you plant Crystal Palace Lobelia in your zone?
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Example Crystal Palace Lobelia timeline · Pittsburgh, PA (Zone 6b)
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Plant Crystal Palace Lobelia
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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First Crystal Palace Lobelia blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Crystal Palace Lobelia dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-10; grown as an annual in most regions, perennial in zones 9-10
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Seedling
2-3 weeksTiny seedlings emerge with cotyledons; very delicate with minimal foliage
Provide bright, indirect light; maintain high humidity; keep soil moist but not soggy; provide bottom heat (65-70°F) for faster germination; thin seedlings when they develop true leaves
Vegetative Growth
3-4 weeksPlants develop bushy mounding form with increasing dark green foliage; branching increases; no flowers yet
Gradually acclimate to outdoor light; maintain consistent moisture; pinch growing tips at 3-4 weeks to encourage branching; fertilize weekly with balanced fertilizer; ensure good air circulation
Pre-flowering
1-2 weeksPlant reaches near-final size with dense foliage; first flower buds appear at branch tips
Continue regular watering and fertilizing; ensure adequate light for flower bud development; reduce nitrogen fertilizer slightly to encourage flowering; continue pinching if more bushy form desired
Flowering
8-12 weeks (spring through fall)Abundant deep blue flowers cover the plant; flowers have distinctive white or pale centers; plant appears like a blue mound in peak bloom
Maintain consistent moisture without overwatering; deadhead spent flowers to encourage continuous blooming (though Crystal Palace self-cleans well); reduce fertilizer; provide afternoon shade in extreme heat above 85°F
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity; spray with water; use neem oil or insecticidal soap; ensure good air circulation
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Yellow sticky traps; spray with insecticidal soap; neem oil; remove heavily infested leaves
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and
Hand-pick; use beer traps; apply diatomaceous earth; remove garden debris where they hide
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Improve air circulation; avoid overhead watering; spray with fungicide if severe; reduce nitrogen fertilizer
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Ensure excellent drainage; do not overwater; use well-draining soil; improve air circulation around base
Uses
NOT edible
CulinaryCrystal Palace lobelia is ornamental only and toxic if ingested. Do not consume any part of the plant. [source]
Ornamental arrangements and containers
CraftCrystal Palace excels in container gardens, hanging baskets, window boxes, and as border edging. Its compact mounding habit and prolific blue flowers make it a classic choice for formal and cottage garden designs. [source]
Cut flowers for arrangements
HouseholdWhile delicate, the deep blue flowers can be used in small fresh flower arrangements or floral designs, typically mixed with other complementary flowers for visual impact. [source]
Pollinator attraction
WildlifeCrystal Palace flowers attract bees, butterflies, and hummingbirds, making it valuable for pollinator gardens and supporting beneficial insects throughout the growing season. [source]
Harvest Tips
Lobelias are ornamental flowers, not harvested for consumption. For cutting arrangements, harvest in early morning when flowers are fully hydrated; cut stems just above leaf nodes; place immediately in water. Remove lower foliage from cut stems. Deadheading spent flower clusters encourages continuous blooming throughout the season.
Fun Facts
- 🌱 Crystal Palace is named for the famous Victorian glasshouse in London, reflecting its use as a popular Victorian bedding plant in ornamental gardens.
- 🌱 Lobelias are among the oldest cultivated flowers, with varieties dating back to the 19th century; Crystal Palace itself was developed in the 1870s and remains virtually unchanged as a classic variety.
- 🌱 The tiny seeds are so small that approximately 750,000 seeds weigh only 1 gram, making seed collection and sowing require extreme care and precision.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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