Rhizomatous evergreen succulent plant from southern and western Africa and Asia. It is made up of dense clumps of long, fleshy, dark green leaves, mottled with light green and silver; the bearing of the leaves can be of two types: some varieties are constituted by a dense rosette, while others have long leaves that grow erect. S. trifasciata has erect leaves with yellowish-green bands on the margins.
The rosette species have a fairly slow growth and remain fairly small in size, while the erect species grow slightly faster and grow up to 100-150 cm. In summer, from the base of the leaves grow two to three long white spikes that cover small, greenish-white, intensely scented flowers.
These plants need bright positions but do not tolerate direct sunlight; they fear the cold, so they can be taken outside in spring and summer, while for the rest of the year they must be kept indoors. However, these plants are not very demanding and grow well even in the shade. It is a plant that comes from subtropical or desert environments, characterized by high temperatures, low rainfall and rather poor and draining soils. The cultivation of the sansevieria It is very simple: in all our peninsula it is recommended to grow it in the apartment. During the summer it is possible to move it outside, on a terrace or in the garden, as long as light and heat are not excessive.
To ensure optimal development it is advised, from April to October, to maintain temperatures always between 18 and 27 ° C and to ensure a very bright exposure (near a window to the south or west or under a pergola), avoiding direct light that could cause leaf burns. However, the shadow is not a problem, it only slows down the growth and can cause the disappearance of streaks and sidebands.
In winter it is possible to induce a slight vegetative rest by adjusting the temperature to 15 ° C (without however ever falling below 13 ° C) and shading a little more.
Very cold or hot drafts can be very harmful. Then place it in a sheltered area.
Like many other succulent plants also the Sanseveria does not need much water, especially in the cold months; throughout the year it is good to let the soil dry completely between one watering and another. Supply fertilizer once a month during the vegetative period, avoiding excess.
Irrigations must be very moderate and you must always make sure that no stagnation occurs. During the summer, it is done on average once a week, making sure that the substrate is dry, leaving it to drain well and always avoiding the use of saucers. It is preferable to use lukewarm water (also tap water) since the sansevieria It is sensitive to thermal shocks. It is very important to pour it on the ground, avoiding the area of the collar and the heart of the rosette: in fact, areas where the rots settle very easily.
In winter we postpone even more: it is usually enough to lightly irrigate every 15-20 days.
We always keep the leaf surface clean, but we avoid the use of polishes that, over time, clog the stomata preventing normal transpiration.
THE SANSEVERIA IN BRIEF
|Family, genus, species||Agavaceae, gen. Sansevieria, about 60 species|
|Type of plant||Succulent, flat, compositions of cacti|
|Height at maturity||From 15 cm to 2 m|
|Width at maturity||From 15 to 60 cm|
|Minimum temperature||13 ° C|
|Ideal temperature||18-27 ° C|
|Exposure||Very bright, no direct light / even light shade|
|Ground||Very light and draining: 2/3 soil, 1/3 sand or perlite|
|Fertilizer||Balanced, for houseplants or cacti. Liquid every 3 weeks|
|soil pH||Neutral to sub-alkaline|
THE CALENDAR OF SANSEVERIA
|Leaf-cutting division||March April|
|Vegetative rest||October to February|