This is a striking plant with light green, fragrant foliage, suitable for the mix border.
This is an upright perennial shrublet, 0.4 × 0.15 m, with an apple-minted scent.
The semi-succulent stems are covered with the remains of the stipules. Young stems are green covered with glandular hairs; older stems turn brown and become glabrous.
The leaves are simple and prominently veined. Both sides of the leaves are covered with glandular hairs. Leaves on the stems are larger than those on the flowering stems. The petiole has long and short glandular hairs which are interspersed with a few soft hairs. The stipules are triangular to bidentate.
The inflorescence is a flowering branch of several pseudo-umbels. Unbranched peduncle is 2555 mm long, and terminates into a pseudo-umbel of 49(15) flowers each. Involucral bracts are ovate, acute, membranous and covered with long, soft hairs. The pedicel is 312 mm long, with a thin covering of hair. The hypanthium is 920 mm long, distinctively thickened at the base and covered with long and short glandular hairs. The 5 sepals are apple-green with a white margin and vary from lanceolate to ovate. The petals are white, often with carmine markings.
Flowering is from June to November, reaching a peak in September.
Pelargonium album has a status of R (Rare) (Raimondo et al. 2009). It is believed that some subpopulations may have been lost due to forestry activities in the areas around Pilgrim's Rest. The population is currently not suspected to be in decline, as there is no forestry-expansion.
Distribution and habitat
This species is limited to the area of Pilgrim's Rest in Mpumalanga. It grows in humus-rich soils in shady, rock crevices on dolomitic hills of Northern Escarpment Dolomite Grassland. The area, a very-species-rich grassland-type and receives between 7001 000 mm during the summer-months of the year.
Derivation of name and historical aspects
The genus Pelargonium, is derived from the Greek word pelargos because the fruit resembles the shape of the beak of a stork. The specific epithet album is derived from the Latin, meaning white and refers to the white flowers.
The genus Pelargonium belongs to the family Geraniaceae, a family of 11 genera and 800 species in the subtropical and tropical world. Other well-known genera includes: Geranium , Monsonia and Sarcocaulon . Pelargonium occurs in S, E and NE Africa, Australia, New Zealand, St Helena, Tristan da Cunha, Madagascar and Asia. Southern Africa is the hotspot of Pelargonium species and in the entire region, 219 of the 270 species are found.
This group of plants has been an attraction to collectors and travellers since the years of exploration in the 1600 and 1700s around the coast of the African continent. Plants were taken to Europe early in the 17th century where it became established in some of the gardens. Amongst the first species to end up in England was P. triste. The Dutch botanist Hermann, collected P. cucculatum on Table Mountain in 1672 and in 1690 this species was established at RBG Kew, London. In Leyden, the Netherlands, ten species were already on record in 1687. The much cultivated and bred ivy geranium' P. peltatum, was introduced to Dutch horticulture in 1700.
The light seed is a feathered, tail-like structure which is coiled in a spiral arrangement. The tail enables the seed to twist around in the wind and drills itself into the soil. This action ensures more seed have a better chance of germination.
Uses and cultural aspects
No cultural uses have been recorded. Pelargonium album is not well known in the horticultural trade.
Growing Pelargonium album
Pelargonium album can be propagated from cuttings. Cuttings can be made throughout the year, but the best results are obtained when they are taken after flowering or in early autumn. Take stem cuttings of 50100 mm, cut below a node and dip in a rooting hormone. Place the cuttings firmly in prepared holes in a coarse river sand, rooting medium. The holes are made to prevent any damages to the ends of the cuttings.
The cuttings can now be placed in a cold frame or a position with enough light. The medium must be kept moist. Rooting takes 34 weeks. Once rooted, transplant the cuttings into a well-drained potting mix. Newly rooted cuttings can be fed with a liquid, seaweed-based fertilizer.
This pelargonium grows well where it gets exposed to moist, light shade for most of the day, in well-drained soil. Its velvety, light green leaves will burn in direct sunlight.
Compost or mulch could be added to help keep its roots cool. It has an almost lime-coloured foliage and its coarse texture should allow it to be exclusively cultivated as a textural plant only. The white flowers are small and insignificant.
It contrasts well with many fine-foliaged species, such as restios and species of Asparagus and Strelitzia . Plant it where it can be displayed with other fragrant Pelargonium spp. In light shade it performs also well with species of Clivia and Plectranthus .
References and further reading
- Dreyer, L. & Van der Walt, J.J.A. 1990. A new species from the Eastern Transvaal. South African Journal of Botany 56(1): 6567.
- Mucina, L. & Rutherford, M.C. 2011. The vegetation of South Africa, Lesotho and Swaziland . 2nd impression. South African National Botanical Institute. Pretoria.
- Powrie, F. 1998. Grow South African plants . National Botanical Institute. Kirstenbosch.
- Raimondo, D., Von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. & Manyama, P.A. (eds). 2009. Red List of South African plants 2009. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
- Stearn, W. 2002. Stearn's dictionary of plant names for gardeners. Timber Press, Portland, Oregon.
- Van der Walt, JJA. 1977. Pelargoniums of South Africa . Purnell, Cape Town.
Kirstenbosch National Botanical Garden