Horseshoe geranium
Pelargonium zonale
Family: Geraniaceae
What it is like
Pelargonium zonale is an evergreen Perennial growing to 1 m (3ft 3in). See above for USDA hardiness. It is hardy to UK zone 9 and is frost tender. It is in leaf all year, in flower in August. The species is hermaphrodite (has both male and female organs). Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers dry or moist soil.
Height (m): 1
Where it is found
Dry rocky hills, stony slopes and forest margins from the Southern Cape to Natal.
S. Africa.
Conservation Status:
Countries/locations it is found in
How it is used
Food
Rating: 1
Leaves and stems - cooked as a vegetable.
Medicine
Rating: 1
All parts of the plant are astringent.
Astringent: Produces contraction in living tissue, reducing the flow of secretions and discharges of blood, mucus, diarrhoea etc.
Other
Rating: 2
An essential oil is obtained from the plant.
Essential: Essential oils that are used in perfumery, medicines, paint solvents, insect repellents etc.
Scented Plants: Plants noted for their scent
How it is grown
An easily grown plant, it requires a light well-drained neutral to alkaline soil in a sunny position, growing well on dry sunny banks. Plants are not very cold-hardy in Britain, tolerating temperatures down to about 0°c. They generally require greenhouse protection but might succeed outdoors when grown in a very sheltered warm spot in the mildest parts of the country. They can also be grown in containers that are placed outdoors in the summer and then brought into the greenhouse or conservatory for the winter. The plants need to be kept fairly dry in the winter. Very tolerant of pruning, they can be cut right down to the base in the autumn when bringing them back indoors, or in the spring to encourage lots of fresh growth. Closely related to P. capitatum.
Propagating it: Seed - best sown as soon as it is ripe in a greenhouse. Stored seed should be sown in early spring in a greenhouse. The seed germinates best with a minimum temperature of 13°c, germination usually taking place within 2 weeks though it sometimes takes some months. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in the greenhouse for at least their first winter. If trying them outdoors, plant them out in early summer and consider giving them extra protection during the winter. Cuttings succeed at almost any time in the growing season but early summer is the best time in order for the new plant to become established before winter.
Best place to grow: South Wall. By. West Wall. By.
Habit: Perennial
Hardiness: 8-11
Growth:
Soil: Light (sandy), medium
Shade: No shade
Moisture: Dry, moist