This genus brings together several dozen species of plants, some of which are used as vegetables as they produce an edible fruit, asparagus, while others are grown as indoor or garden plants in warmer climates; they come from Europe and Africa. The plants are made up of erect stems of a light green colour, very ramified; the asparagus do not have real leaves, but cladodes, thin green twigs. A. plumosus is a climbing species, with cladodes similar to the leaves of ferns. A.
meyeri has foxtail branches; A. sprengeri has a feathery and soft appearance, with thin and very branched cladodes. Some species produce small white flowers, followed by round dark berries.
The Asparagus densiflorus plant prefers bright places, but sheltered from direct sunlight. Almost all species fear the cold, preferring winter temperatures around the 15°C; some species, on the contrary, resist to the cold, but not to temperatures below the zero.
Asparagus plants grown for ornamental purposes do not tolerate stale air; for this reason it is good to ventilate the room frequently, without subjecting the plants to cold air currents.
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In summer, the Asparagus densiflorus need abundant watering, even daily; with the arrival of the cold season, the watering becomes thinner, in mid-winter it is advisable to wait for the soil to be well dry between one watering and the other. In the growing season, from March to September, provide fertilizer for green plants dissolved in the water of the watering every 15-20 days.
To ensure that the asparagus plants grow as well as possible, it would be advisable to use water that is not calcareous.
Asparagus densiflorus plants prefer loose, fertile and very well drained soils. Increase container drainage by placing coarse-grained material on the bottom before filling with a substrate of good quality universal soil and sand.
The plant is repotted only when you realize that it has become too large for the pot in which it is housed. Repotting should be done in spring.
The multiplication of the specimens belonging to this variety takes place by seed, to be carried out in spring in a warm bed; it is good to sow in a mixture of peat and sand in equal parts and wait for the small plants to reach at least some centimetres of height before repotting them individually; remember to water often the seedbeds.
The asparagus plant can also be multiplied by division of the rhizomes, an operation to be carried out at the beginning of spring, to be buried at a depth of 2/3 cm in a sheltered container. Once they have taken root, they can be transferred into the cultivation pot.
Asparagus – Asparagus densiflorus: Parasites and diseases
The Asparagus densiflorus fear very much the small insects which can visibly ruin the cladodes, giving a “plucked” look to the plant, such as aphids, cochineal and red spiders.
To counteract the problem there are different systems that can be effective; if the plant is not very large, you can eliminate the parasites with the use of a cloth with alcohol, or, in the case of red spiders, increase the nebulization of water on the leaves.
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