How to Grow Hermine Grashoff
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Hermine Grashoff
Pelargonium 'Hermine Grashoff'
flowerHermine Grashoff is a distinctive ivy-leaf geranium (pelargonium) cultivar known for its striking double flowers in a unique salmon-pink or coral-red color with darker veining. This trailing or semi-climbing variety produces abundant blooms throughout the growing season and is prized for containers, baskets, and as a houseplant. It combines the vigorous growth habit of ivy-leaf geraniums with exceptionally showy, long-lasting flowers.
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Example Hermine Grashoff timeline · Pittsburgh, PA (Zone 6b)
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Plant Hermine Grashoff
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 Hermine Grashoff blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Hermine Grashoff dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 9-11; can be grown outdoors year-round in warmer climates or as a tender perennial/houseplant elsewhere
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Cutting/Rooting
2-3 weeksYoung cutting with developing roots, typically 3-4 inches long with 2-3 leaf nodes visible
Keep in humid conditions (70% humidity ideal). Use well-draining propagation mix. Provide bright, indirect light. Avoid direct sun and waterlogging.
Establishment
3-4 weeksRooted cutting developing true leaves and establishing a small root system
Gradually acclimate to brighter light. Begin light fertilizing every 2 weeks at half strength. Pinch growing tips to encourage branching.
Flowering
8+ weeks (blooms continuously in season)Abundant clusters of double coral-pink to salmon-red flowers with darker veining appear throughout stems
Maintain full sun and good air circulation. Switch to higher-phosphorus fertilizer to support blooming. Deadhead spent flowers regularly to encourage continuous blooms.
Winter/Dormancy (if applicable)
3-4 monthsReduced growth and flowering in cooler temperatures; plant may drop some leaves
Reduce watering significantly. Provide cooler conditions (50-60°F ideal). Minimal fertilizing. Prune lightly if desired. This rest period improves spring vigor.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil every 7-10 days. Maintain good air circulation. Use yellow sticky traps. Remove heavily infested leaves.
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Increase humidity with regular misting. Spray with water or insecticidal soap. Apply neem oil if severe. Isolate infested plants.
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Remove with rubbing alcohol on cotton swabs. Spray with insecticidal soap or horticultural oil. Isolate plant and monitor closely.
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Allow soil surface to dry between waterings. Use yellow sticky traps. Apply sand layer on top of soil. Use beneficial nematodes if severe.
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Improve air circulation. Remove dead/damaged foliage. Reduce humidity. Avoid wetting foliage. Apply fungicide if necessary.
Uses
Edible Flowers
CulinaryThe flowers, though not commonly eaten, are technically edible and can garnish desserts or salads for ornamental appeal. Pelargonium flowers have a slightly floral, peppery taste. [source]
Container & Hanging Basket Display
HouseholdThe trailing growth habit and prolific double blooms make this cultivar ideal for hanging baskets, mixed containers, window boxes, and as a trailing accent in container gardens. Excellent for vertical gardening. [source]
Houseplant & Indoor Decor
HouseholdGrows well as a potted houseplant on bright windowsills or under grow lights. Long blooming season provides continuous color indoors, and it's easy to propagate for sharing. [source]
Traditional Herbal Use
MedicinalPelargonium species have been used in traditional medicine; geranium leaf tea is sometimes used for astringent properties, though scientific evidence is limited. Always consult a professional before medicinal use. [source]
Pollinator Support
WildlifeAbundant flowers attract bees, butterflies, and hoverflies, supporting local pollinator populations and beneficial insects in gardens. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Not typically harvested for fruit/seeds like vegetables. Deadhead spent flower clusters regularly (pinch off after blooming) to encourage continuous flowering throughout the season. Can harvest cuttings for propagation year-round; best success with 3-4 inch stem cuttings taken in spring or early summer. Take cuttings just below a leaf node.
Fun Facts
- 🌱 Hermine Grashoff is a hybrid ivy-leaf geranium with genetics tracing back to South African Pelargonium peltatum species, renowned for producing some of the most intensely colored double flowers in the pelargonium family.
- 🌱 Unlike most geraniums, this cultivar can be propagated easily from soft cuttings without rooting hormone, rooting successfully in just 2-3 weeks under proper conditions.
- 🌱 The name 'Hermine Grashoff' honors a German geranium breeder, reflecting the cultivar's European origins and the significant role German horticulturists played in developing modern pelargonium varieties.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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