How to Grow Silvery Spike
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Silvery Spike
Acalypha pendula × Iresine herbstii
shrubSilvery Spike is a striking ornamental foliage plant prized for its silvery-white variegated leaves with deep red or burgundy undersides. It's a tender perennial that thrives as a houseplant or in warm outdoor gardens, adding dramatic color contrast to mixed containers and beds.
When should you plant Silvery Spike in your zone?
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Example Silvery Spike timeline · Pittsburgh, PA (Zone 6b)
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Plant Silvery Spike
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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Harvest Silvery Spike
Around May 17≈ 30 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Silvery Spike dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 10b-11; grow as an annual or container plant in cooler zones
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Propagation/Rooting
10-14 daysStem cuttings develop roots in water or propagation medium; new growth appears pale
Use 3-4 inch tip cuttings; maintain 70-75°F; mist daily; provide bright indirect light
Establishment
2-3 weeksYoung plant develops 2-3 sets of true leaves with emerging variegation and color
Pot into individual containers; maintain warm temperatures; begin light fertilizing; ensure good drainage
Vegetative Growth
4-8 weeksPlant grows rapidly, developing fuller foliage with increasingly prominent silvery-white and burgundy coloring
Pinch tips regularly to encourage branching; fertilize every 2 weeks with balanced fertilizer; maintain moisture
Mature Foliage Plant
Ongoing (6+ months)Plant reaches desired size with full silvery variegation, compact branching, and vibrant leaf color
Maintain shape through pinching; reduce fertilizing in winter; monitor for spider mites; continue consistent watering
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity; spray leaves with water; use insecticidal soap or neem oil weekly if infested
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Remove with rubbing alcohol on cotton swab; spray with neem oil; isolate affected plant
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Prune affected stems; spray with horticultural oil or insecticidal soap every 7-10 days
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Use yellow sticky traps; spray with insecticidal soap or neem oil; improve air circulation
Uses
Interior Ornamental Display
HouseholdSilvery Spike serves as a stunning houseplant for bright windowsills, conservatories, and vivariums. Its dramatic silvery-white foliage with burgundy reverses adds sophisticated color contrast to any indoor space. [source]
Container and Combo Plantings
CraftHighly valued in mixed container gardens and annual beds for its striking color; works as a thriller, filler, or spiller depending on cultivar form. Provides year-round foliage interest in frost-free regions. [source]
Tropical Garden Accent
WildlifeIn warm climates, Silvery Spike creates privacy screens, hedges, and tropical garden backgrounds while attracting minimal pest damage in balanced ecosystems. Provides visual structure and height. [source]
Air-Purifying Foliage Plant
HouseholdLike many houseplants, Silvery Spike contributes to indoor air quality through photosynthesis and transpiration, improving humidity and oxygen levels in indoor environments. [source]
Floral Arrangement Greenery
CraftDelicate stems and variegated leaves work beautifully as supplementary greenery in fresh or dried floral arrangements, adding texture and silvery tones to bouquets. [source]
Harvest Tips
This is a foliage plant, not harvested traditionally. Pinch growing tips every 2-3 weeks to encourage bushier growth and better leaf color development. Propagate from 3-4 inch stem cuttings year-round.
Fun Facts
- 🌱 Silvery Spike exhibits extraordinary leaf variegation that intensifies under bright light conditions—moving it to brighter locations will enhance the silvery-white coloring and burgundy undersides.
- 🌱 The plant is frost-tender and will die back if exposed to temperatures below 50°F; it's best treated as a tender annual in cold climates or brought indoors before the first frost.
- 🌱 Despite being a foliage plant, Silvery Spike occasionally produces small, inconspicuous flowers; however, the foliage is the main ornamental attraction and far outshines any blooms.
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