The leek, whose Latin name is Allium porrum, is a garden plant grown throughout Italy and probably originating in the Mediterranean regions. The stem of this plant is used, consisting of the leaf sheaths, closely overlapping each other. It is used raw, as a condiment, or cooked.
Allium porrum is a biennial plant that is grown as an annual.
40-80 cm tall, it has a bundled root system formed by numerous thin roots, these originate from a reduced stem.
Linear and lanceolate leaves are also inserted into the stem, closely overlapping each other in the basal portion, and arranged in two opposite series.
In the year following that in which the sowing of Allium porrum is carried out, the flower scape up to 80 cm high is formed, bearing at the upper end an umbrella-shaped, globular inflorescence, formed by a very large number of white flowers, pink or lilac.
The seeds are small, black, angular.
The Long Giant in winter, the Elephant, the Monstrous of Carentan, the Genovese, Grosso Monstrous of Rouen, Grosso Corto of Summer, Giant of Italy.
Climate and terrain
Climate: likes temperate climates, but also tolerates cold well.
Soil: Leek grows well in rather light and fertile soils
Rotation and consociaizone
Rotation: must not follow cabbage and potatoes. It must not be grown again in the same garden before at least four years have passed since the previous crop.
Association: with cabbage, lettuce, fennel, carrots.
Sowing and planting
Sowing takes place in seedbeds at a depth of a few millimeters: in a warm bed in December-January or outdoors from March to June, directly planted in the garden from March to July.
When the seedlings have formed the fourth / fifth leaf and the diameter of the false stem is about 1 cm, the transplant is carried out; this operation is carried out after having slightly topped the leaves, on cloudy days or after sunset.
The soil is prepared by deep digging and subsequent hoeing. during which 30/40 g / m2 of complex fertilizer 6-12-9 are administered. After transplanting, some weeding and tamping are carried out, watering the soil if dry.
Distance between plants 15-20 cm in the row, and 25-30 cm between the rows.
Collection and conservation
Harvesting takes place at different times, depending on the period in which sowing and transplanting took place; the harvesting periods fall in summer, autumn and winter. The leek can be stored, under suitable conditions, for quite long periods of time. Before using it, remove the outermost leaves;
Mature manure (4 g / m2) must be buried in summer / autumn at a depth of 30 cm. During cultivation, a covering fertilization is also carried out, with a limited quantity of calcium nitrate; it is advisable not to exceed the quantity of nitrogen fertilizers, as, in this case, leeks would be not very storable.
The soil must always be kept free from weeds, carrying out repeated weeding and weeding.
In periods when it does not rain it is necessary to water abundantly but avoid stagnation of water.
Leek - Allium porrum: Adversity
Cancer causes deformations and cracks. The fight is based on treatments based on Bordeaux mixture, for the rest the diseases and parasites are similar to those of garlic and onion.