Family: Hyacinthaceae ( ~Liliaceae)
Hyacinths are well known bulbs all over the world especially for their heavenly scent and beautiful colours and are commonly used as pot plants or sometimes in the garden. Many of these originate in the Mediterranean, like the well-known Muscari. In southern Africa we have our own selection of indigenous hyacinths, some with quite bland flowers, but some with quite strikingly beautiful flowers. One of the biggest genera, with the most colourful flowers is Lachenalia. Many lachenalias are used commercially in horticulture and rival many of the more common, well-known hyacinths on the market.
Description
Lachenalias are typical winter-growing bulbs that are deciduous and go completely dormant during the hot summer months Lachenalias consists of a single, fleshy bulb about the size of a large marble, with two strap-like, lanceolate leaves up to 150 mm long. They are usually, but not always, densely covered with little bumps called pustules. The inflorescence can grow up to a 250 mm tall and is covered with very delicate, slightly raised, creamy-white flowers that have magenta tips. The leaves will start to emerge a few weeks after the first rains in autumn, but the flower comes much later in middle to late spring, generally only appearing as the leaves are dying back.
Distribution
Lachenalia is generally restricted to the winter rainfall parts of South Africa and Namibia.
Derivation of name and historical facts
Joseph Franz Jacquin, son of a Baron Joseph Jacquin, who was studying the collections of these new plants in the Schönbrunn Palace Gardens near Vienna in the late 1700s, decided to describe some of the fascinating plants and gave them the name Lachenalia after a professor of botany in Basel, Switzerland, Werner de Lachenal. He later described L. liliflora in about 1798, liliflora referring to the funnel-shaped flowers resembling certain species of Lilium.
Ecology
These plants would typically grow in lowland renosterveld areas favouring hilly slopes and flats but today much of this area has disappeared to farming and urban sprawl. The soil consists mainly of clay and is usually quite stony, which helps the plants to avoid being eaten by moles. They are probably pollinated by bees during the day and perhaps also at night by moths. They survive the hot, dry, fire-prone summers by going dormant and only shooting with the autumn rains.
Growing
Lachenalia is very easy to grow as a pot subject and can be very rewarding. The soil medium should be fairly well drained and consist of about half coarse, washed sand and half finely sieved compost. Plants should be kept in a sunny position and will grow very happily outside during the winter months providing it doesn’t drop below freezing. In order to keep the leaves green when they come into flower, watering should be maintained until flowering time.
The bulbs are planted in early autumn at a depth of 1-2 cm below soil level and should be watered well and then not again until the leaf shoots appear, after which a good drench once per week is suggested. Offsets develop readily and these can be removed when large enough during the summer-dormant period.
Seeds form easily after hand pollination and are sown 3-4 mm below the soil surface in mid-autumn in the same medium recommended for mature bulbs. Take care not to sow too thickly to prevent the occurrence of damping-off fungi, and water the seedlings with a fine spray every few days. Germination of fresh seeds occurs within two to three weeks and the seedlings usually flower for the first time in their third year or sometimes even in their second year under ideal conditions.
They are easily propagated by leaf cuttings, which can be removed from the plant by slicing them at the base of the leaf blade. These leaves are then half buried in a very sandy medium and left in a cool place out of direct sunlight. The soil should be kept on the dry side to avoid the leaves rotting, but the humidity should be quite high. If these conditions of dry soil coupled with humid air prevail, within a few months small bulbils will appear along the cut edge at the base of the leaf. Eventually the leaf will wither, but the bulbils can be planted like normal bulbs the following season. Flowering will take place after one to two years.
They are also easily raised from seed, which should be sown in autumn in a similar medium used for cultivation with a thin layer of soil placed over the seed. The seedlings should germinate within about two to three weeks. Flowering will take place after two to three years.
They don’t have many pests apart from snails and worms (which can be removed by hand) and mealy bug, which should be treated with a systemic pesticide.
Not much fertilizing is required for these bulbs as they are not generally very hungry, but they wouldn’t be adverse to the odd splash of a diluted, low-nitrogen, liquid fertilizer.
Genus restricted to the winter rainfall regions of South Africa. Bright light with good air circulation. Must have media with excellent drainage.
Bulbs begin to become active as soon as temperatures begin to fall after the summer. Once temperatures drop, pots should be watered thoroughly once and then wait until new growth appears. Infrequent heavy irrigation is preferable to frequent, light watering which can lead to rotting of the bulb. It is always preferable for the media to be slightly dry rather than too wet.
Foliage will begin to yellow as temperatures rise in summer and water should be completely withheld and containers moved to a cool, dry location once the foliage has withered.