About 30-40 bulbous plants belong to the genus Hymenocallis, originating in Central and South America, closely related to the genus Ismene. The species of this genus have large roundish bulbs, which are buried at a depth of about 12-15 cm, and are almost always recognizable because of the beautiful shapes of their flowers; there are species of hymenocallis evergreens or deciduous.
Each bulb produces 4-6 large, slightly fleshy, arched leaves, very similar to the leaves of the amaryllis, up to 40-50 cm long; from the center of the head formed by the leaves in summer a thin fleshy stem rises, up to 50-60 cm high, on which the large umbrella-shaped inflorescences bloom; the flowers are pure white, intensely scented; the base of the flower is tubular, trumpet-like, from the sides the tepals depart, thin and elongated, which give the flower a very particular shape. The flowers are followed by small fleshy fruits, containing seeds. These bulbous plants are mainly cultivated in pots; flowers can also be used as cut flowers.
Among the main varieties of cultivated Hymenocallis we report the Hymenocallis amancaes, Hymenocallis narcissiflora, Hymenocallis speciosa and Hymenocallis harrisiana.
Bulbs and plants of hymenocallis they fear the cold, therefore in the southern regions they must be protected during the cold season; in the rest of the peninsula it is good to dig up the bulbs from the ground during the winter, or cultivate them in pots so as to be able to move the container to a sheltered place during the winter.
Generalmante prefer locations that are not too sunny, partially shady, although they can be kept in the sun during the coolest months of the year. Even if grown in pots it is advisable to allow the hymenocallis a winter vegetative rest period, with temperatures below 7-8 ° C, therefore we avoid keeping the containers in an excessively hot place.
From March to September water regularly, avoiding the soil to dry completely; we water abundantly especially during the summer months. With the arrival of cold we thin out or suspend watering. In the vegetative period let's remember to provide fertilizer for flowering plants, every 10-15 days, dissolved in the water of the waterings.
Speaking of soil the hymenocallis need a very soft and rich soil, well drained but not too dry and arid. They are cultivated without problems even in containers that are not excessively capacious because the root development and the aerial part is not excessively intense.
To plant the hymenocallis bulbs, make sure you have quality soil by buying it in a nursery or garden center because the quality of the soil is the first point of reference for obtaining flowers and plants of excellent quality.
The best time for bulb multiplication is in autumn, when unearthing the large bulbs you can easily see the new bulbils, which can be detached and repotted individually.
Hymenocallis: Pests and diseases
especially during the summer they particularly fear the # 009933 attack. An excess of water or too heavy soil can favor the development of rot of the bulbs or roots.