Galtonia species are usually grown from hardy bulbs in the garden and reach a height of between 90 cm and 1.2 metres.
They have a long blooming period from the middle of summer and throughout autumn.
When in bloom they carry white bell shaped flowers atop long upright stems.
Some common names of Galtonia include Summer Hyacinth and Giant Summer Hyacinth.
Galtonia candicans by lilli2de.
Common Names: Giant Summer Hyacinth, Summer Hyacinth, Cape Hyacinth, Spire Lily.
Life Cycle: Hardy perennial.
Height: 24 to 48 inches (60 to 120cm).
Native: Southern Africa.
Growing Region: Zones 6 to 10. As an annual in cooler areas.
For quicker results you should grow Summer Hyacinth from bulbs. This is because seed grown Galtonia can take as long as five years before they will first flower.
The bulbs should be planted about 12 to 15 cm (5 to 6 inches) deep at the start of spring.
If growing from seed, then sow in spring or summer, and lightly cover the seed.
The spacing of Galtonia plants is species dependent, plant small Galtonia varieties from 15 to 20 cm (6 to 8 inches) apart and tall ones about 40 to 50 cm (16 to 20 inches) apart.
Ideally, summer hyacinth should be grown in a sunny part of the garden. Locate in an area that has good drainage and a moist soil.
If you start Galtonia species off indoors from seeds, then start about 7 or 8 weeks in advance. It should take two or three weeks for seeds to germinate at a temperature of about 20°C (68°F). Transplant Galtonia out in the garden in autumn, or at the start of spring.
It is pretty easy to look after Galtonia species such as giant summer hyacinth. They prefer a moist soil, so keep well watered in dry periods. If you live in a very cold area it is a good idea to bring bulbs inside during the winter.
If you require more Galtonia plants for your garden, then propagate by planting the offsets that they produce. This can be done in autumn or spring.