98 – 112 days. Silver Shield plectranthus seeds are a simple and exotic Australian grow ideal for many hot and humid gardens. Silver Shield seeds promise 24 – 36” tall mounds of silvery green leaves with bluish white floret spikes perfect for highlighting walkways, borders, fences, or patios. Silver Shield plectranthus is native to eastern Australia's sweltering and rugged rainforests and will thrive all summer in similar climates. Silver Shield seeds mix well with lavenders and other soft blooms that last well into the season. 100 seeds.
Growing Silver Shield Plectranthus Garden Seeds
- Taxonomy: Plectranthus argentatus
- Other Names: Silver Spurflower
- Seed Type: Annual
- Sow Indoors or Outdoors: Silver Shield plectranthus is easy to grow from seed and recommended for direct sowing outdoors after the frost. For earliest blooms, begin seeds indoors 4 – 6 weeks prior and transplant plectranthus seedlings to a well-shaded spot either indoors or out.
- Days to Maturity: 98 - 112 days
- Hardiness Zone: 10 - 11
- Planting Depth: Plant 1 - 2 seeds ¼” deep
- Plant Spacing: 24 – 36”
- Growth Habit: 24 – 36” tall mounding shrub with a 24 – 36” spread of silver leaves and florets
- Soil Preference: Rich, humusy, evenly most, well-drained
- Light Preference: Partial sun – full shade
- Diseases/Pests/Troubleshooting: Silver Shield plectranthus will only tolerate full sun if grown in a cool summer climate, otherwise, keep plants shaded in hot and humid gardens. Plants can not endure frosts. Avoid overwatering because plants will not perform well if not properly drained, making Silver Shield plectranthus susceptible to crown rot, mold, and mildew. Plectranthus has no serious pests or diseases, but monitor regularly for mites, mealybugs, and scale.
- Color: Silvery green foliage with bluish white floret spikes
Silver Shield plectranthus is easy to grow from seed and recommended for direct sowing outdoors after the frost. For earliest blooms, begin seeds indoors 4 – 6 weeks prior and transplant plectranthus seedlings to a well-shaded spot either indoors or out. For direct sowing, plant 1 – 2 Silver Shield plectranthus seeds ¼” deep and 24 – 36” apart in rich, humusy, evenly most, and well-drained soil in partial sun to full shade. Silver Shield plectranthus will only tolerate full sun if grown in a cool summer climate, otherwise, keep plants shaded in hot and humid gardens. Plants are native to eastern Australia's rainforests and can not endure frosts. Avoid overwatering because plants will not perform well if not properly drained, making Silver Shield plectranthus susceptible to crown rot, mold, and mildew. Plectranthus has no serious pests or diseases, but monitor regularly for mealybugs, mites, and scale. Silver Shield plectranthus matures in 98 – 112 days as 24 – 36” tall mounding ground cover shrubs with a 24 – 36” spread of silvery green foliage with bluish white floret spikes.
Plectranthus argentatus, often known as Silver Shield or Silver Spurflower, is a low-growing member of the mint family and native to the warm and humid rainforests of eastern Australia. Plectranthus argentatus has been recognized by London's Royal Horticultural Society with its Award of Garden Merit.