The blue plumbago is a deciduous perennial shrub, native to China and central Asia. The stems are thin, arched or hanging, they develop starting from fleshy rhizomes, which tend to widen, making the plant upholstery; the leaves are oval, dark green, thick and leathery, becoming bronze in autumn, before falling from the plant.
The aerial part of these specimens completely dries up during the coldest months of the year, starting to develop again in late spring; starting from late June, until the end of September, it produces numerous funnel-shaped flowers, gathered in clusters, of an intense blue color, similar to the plumbago flowers, with respect to which it is much more rustic.
Much used in rock gardens, the Ceratostigma plumbaginoides can be planted even in a container.
The specimens of Ceratostigma plumbaginoides prefer positions located in sunny areas where they can receive a few hours of direct light a day; they grow very well even in partial shade, especially in places with very hot summers where very high temperatures and direct sunlight could ruin the blue plumbago specimens.
The plants of this genus do not fear the cold, although particularly cold winters can ruin the plant very much, which is unlikely to produce flowers the following summer.
Usually, in the winter season this kind of plant enters in vegetative rest and the aerial part completely dissociates, to then reform itself in the spring season.
As for the correct supply of water, it is good to proceed with regular watering, especially in the hottest months of the year; these plants easily withstand short periods of drought and fear water stagnation, which can cause serious damage to the root system.
From June to September, provide fertilizer for flowering plants mixed with water for watering, every 10-15 days so that the plant can receive all the nutrients it needs to develop at its best.
To have a good growth of the blue plumbago it is good to place the plants of this variety in a very well drained soil; these plants develop without problems in any soil, even poor and stony, as long as they are free from water stagnations that are particularly harmful to the blue plumbago.
The reproduction of these plants to obtain new specimens takes place by cuttings in autumn, or by division of the tufts at the beginning of spring. THE ceratostigma plumbaginoides they can also be sown, in March-April, in seedbeds or directly at home when the external temperatures are pleasant and there is no longer the risk of late frosts that could compromise germination.
Blue plumbago - Ceratostigma plumbaginoides: Pests and diseases
these plants, which have great qualities of rusticity and resistance, are generally not attacked by pests or diseases. They can, however, present major problems and the onset of dangerous radical rot if the soil in which they are placed does not allow water to drain and form at the base of the plant of water stagnation.