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© Frances Michaels
COMMON NAMES: asparagus BOTANICAL NAME: Asparagus officinalis FAMILY: Liliaceae, the lily family PLANT DESCRIPTION Asparagus is a herbaceous perennial, with both male and female plants. Asparagus plants are ferny and grow to 1.5m. Plant in full sun in a well-drained soil. Thorough preparation of the soil is needed as asparagus crowns are long-lived. Dig deeply, or if possible double dig the trenches and incorporate generous amounts of compost and well-rotted manure into the soil. In heavy clay soils deep digging should be avoided as it will make drainage worse, in this case beds should be mounded and gypsum applied. The pH of the soil should be 6.5 - 7.0, lime if necessary. If more plants are required the crowns can be divided when 3 years old. This is done during winter dormancy. Asparagus is usually considered a temperate plant but it is easy to grow in a subtropical climate as it thrives on the rain and has no problems with pests or diseases. In fact, in old, abandoned gardens, asparagus can be seen growing years later amongst tall grass and weeds.
USES Asparagus is a delicacy and can be eaten raw or cooked.
PLANTING Plant in winter or early spring, while the crowns are still dormant. Plant in furrows about 20 cm deep and 30 cm wide. Place the crowns onto a small mound in the centre of the furrow, so that the roots point down at about 45°, spread the roots out carefully. Backfill with compost to a depth of 7.5 cm. Space the plants 45cm apart, with 1.2 m between rows. Fill in the trench gradually as growth progresses.
ANNUAL CARE After the first frost in winter or when the foliage browns off, cut off the old tops about 7.5 cm from the soil surface. Try to keep the berries from falling on the ground, as they will germinate and choke the bed. Apply a generous dressing of compost and well-rotted manure to feed the bed for its spring flush of growth. Then top with a thick hay mulch.
HARVEST Care should be taken to harvest very lightly the first year after planting, to allow the crowns to build strength. In subsequent years in cool areas stop cutting spears in late spring; in subtropical areas it is usually possible to harvest a second time during the wet season. Cut the spears carefully to avoid injuring the crown. We harvest by a rule-of-thumb, if the spears are thicker than a pencil we cut them before the spears branch, usually at approx. 20 cm high, if they are skinnier, we leave them to develop and feed the crown.
Available from Green Harvest: July to September 2010 Purple asparagus available as seed
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ASPARAGUS
GROWING INFORMATION