How to Grow Regal Pelargonium
Regal Pelargonium
Pelargonium x domesticum
flowerRegal pelargoniums are stunning ornamental flowering plants with large, showy blooms in shades of red, pink, purple, and white, often with contrasting markings or dark blotches. These compact, bushy plants are prized for their dramatic spring-to-summer flowering displays and velvety foliage. They are commonly grown as potted houseplants and container specimens, though they can be used in gardens in mild climates.
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Example Regal Pelargonium timeline · Pittsburgh, PA (Zone 6b)
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Plant Regal Pelargonium
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 Regal Pelargonium blooms
Around Aug 15≈ 120 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives year-round in zones 10-11; zones 9-10 work with winter protection or container growing
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Get my Regal Pelargonium timeline →Growth Stages
Seedling
3-4 weeksTiny cotyledons emerge and develop true leaves; delicate green shoots establish root system
Keep soil consistently moist (not soggy). Provide bright, indirect light. Maintain 65-70°F. Thin seedlings to prevent damping off.
Vegetative/Establishment
8-12 weeksPlant develops bushy foliage with multiple stems and characteristic deeply lobed, textured leaves; no flowers yet
Pinch growing tips to encourage branching. Maintain moderate watering. Fertilize every 2 weeks with balanced fertilizer. Provide 6-8 hours bright light daily.
Bud Formation
3-4 weeksFlower buds develop at stem tips; distinctive flower clusters (umbels) form with tight, tightly-packed buds
Reduce nitrogen fertilizer, switch to phosphorus-rich formula to promote blooming. Maintain consistent light and temperature (60-70°F ideal). Water carefully to avoid bud rot.
Flowering
6-12 weeks (can extend with proper care)Large, showy flowers open in clusters with ruffled petals in reds, pinks, purples, and whites, often with dark blotches or veining
Deadhead spent flowers regularly to extend bloom season. Continue phosphorus-rich fertilizer every 2 weeks. Keep foliage dry. Avoid moving or drastic temperature changes.
Post-Bloom/Rest
2-3 months (typically fall/winter)Flowering slows or stops; plant enters semi-dormancy period; foliage remains but growth slows significantly
Reduce watering and cease fertilizing. Provide cooler temperatures (55-60°F) if possible to promote winter rest. Prune back by 1/3 in late summer to rejuvenate for next season.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil; remove heavily affected leaves; introduce parasitic wasps; maintain good air circulation
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Increase humidity and mist leaves; spray with miticide or sulfur; remove heavily webbed foliage; improve air circulation
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Wipe with alcohol-soaked cotton swabs; spray with insecticidal soap; isolate infested plants; apply neem oil weekly
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Remove affected foliage immediately; improve air circulation; avoid wetting foliage; reduce humidity; apply fungicide if severe
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Remove infected leaves promptly; avoid overhead watering; apply sulfur or copper fungicide; ensure good air flow
Uses
Indoor and outdoor ornamental display
HouseholdRegal pelargoniums are prized specimen plants for windowsills, patios, conservatories, and flower beds due to their spectacular large blooms and compact growth habit. They create dramatic focal points in container gardens and potted displays. [source]
Cut flowers and floral arrangements
CraftThe showy flower clusters are excellent for cutting fresh arrangements, particularly in spring and early summer when blooms are most abundant. The velvety petals and deep colors add sophistication to bouquets. [source]
House plant and container gardening
HouseholdRegal pelargoniums thrive in pots indoors on bright windowsills and are perfect for gardeners with limited space or in regions with cold winters. They can be easily moved to protect from frost or excessive heat. [source]
Pollinator attraction
WildlifeThe bright, abundant flowers attract bees, butterflies, and hoverflies, making them valuable for supporting pollinator populations in gardens and landscapes. [source]
Harvest Tips
These are ornamental flowers, not edible plants. Deadhead spent blooms by pinching or cutting just below the flower cluster to encourage continuous flowering throughout the season. Cut flowers for arrangements when they are just opening; they will last 7-10 days in water.
Fun Facts
- 🌱 Regal pelargoniums (also called Martha Washington pelargoniums or Show pelargoniums) have been cultivated since the 18th century and remain popular Victorian house plants with a rich horticultural heritage.
- 🌱 Unlike common zonal geraniums, regals have a natural dormancy period and prefer cooler winters (50-60°F) to set flower buds prolifically, making spring their prime blooming season.
- 🌱 The distinctive dark blotches and veining patterns on regal pelargonium petals are unique to each bloom, making every flower slightly different—a feature that delighted Victorian plant enthusiasts.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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