This genus brings together a few dozen species of plants, some of which are used as vegetables since they produce an edible fruit, asparagus, while others are grown as apartment or garden plants in milder climates; they come from Europe and Africa. The plants are made of erect stems of light green color, very branched; asparagus has no real leaves, but cladodes, thin green branches. 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 dark-colored roundish berries.
The Asparagus densiflorus plant prefers bright places, but sheltered from direct sunlight. Almost all species fear the cold, preferring winter temperatures around 15 ° C; some species instead resist the cold, but not at temperatures below 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 drafts.
In summer Asparagus densiflorus need abundant watering, even daily; with the arrival of the cold season watering is thinned out, in the middle of winter it is advisable to wait until the soil is dry between one watering and another. In the vegetative 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 at their best, it would be advisable to use non-calcareous water.
Asparagus densiflorus plants prefer loose, fertile and very well drained soils. Increase the drainage of the containers by placing a coarse-grained material on the bottom before filling with a substrate consisting of universal soil of good quality and sand.
The plant is repotted only when it is noticed that it has become too large for the vase in which it is housed. Repotting should be done in spring.
The multiplication of the specimens belonging to this variety occurs 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 seedlings to reach at least a few centimeters in height before repotting them individually; remember to water the seedbeds often.
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 to the cultivation vessel.
Asparagus - Asparagus densiflorus: Pests and diseases
Asparagus densiflorus are very afraid of small insects that can conspicuously ruin cladodes, giving the plant a "plucked" appearance, such as aphids, cochineal and red spider mites.
To counter the problem there are different systems that can be effective; if the plant is not very large, it is possible to eliminate the parasites with the use of a cloth with alcohol, or, in the case of red spider mites, to increase the nebulizations of water on the leaves.