February 4, 2023
Plectranthus argentatus or Coleus argentatus

Plectranthus argentatus at the St. James's Park in London planted in a mixed border.

Both names Plectranthus and Coleus are recognized. Charles Louis L’Héritier de Brutelle (1746-1800) a French botanist, in 1788, placed it in Plectranthus. In 1790, João de Loureiro (1717-1791), a Portuguese botanist renamed it Coleus. In descriptions in the 1800s, they were separated due to the details of the stamens. In 1962, J. K. Morton in the Journal of the Linnean Society of London moved it into Plectranthus.

Coleus argentatus or Plectranthus argentatus is commonly called Silver Spurflower. It is related to the mint. It is part of the Lamiaceae family of plants. This species was first described by Stanley Thatcher (1910-1973) an Australian botanist. The name “argentatus” is for the leaves that are hairy and look silvery. It is from Latin.

Plectranthus argentatus or Coleus argentatus
Plectranthus argentatus at the St. James’s Park in London planted in a mixed border.

Plectranthus argentatus can grow to 90cm or 3ft. It is native to Australia. It is an evergreen shrub. The hairy leaves are ovate. They are bluish-white. The flowers grow on terminal racemes of up to 12in or 30cm. Usually, it is grown as half hardy annual, in temperate climates.

How to grow Plectranthus argentatus:

Grow Plectranthus argentatus in partial shade. Plant it in moist but well-drained soil. Propagate Plectranthus argentatus by seed or semi-hardwood cuttings. No pruning is necessary. They are easy to maintain. They are pest-free and disease-free.

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