The Sequoiadendron giganteum or sequoia gingante is a majestic tree native to North America. It has an erect stem and conical crown, which becomes almost cylindrical with the passing of the centuries; there are specimens of heights close to 90 m and with a trunk of a diameter close to 10 m. The bark is reddish-brown, deeply fissured, very thick; the branches are horizontal, or facing downwards, with the apical part facing upwards; the leaves are needle-like, with a triangular section, gray-green in color. In late summer it produces small roundish pine cones, containing many dark seeds, which can remain on the tree even for many years. These trees are used only in parks, as they require large tracts of land; they are very long-lived and can survive for centuries, the growth is quite fast, especially for the first decades of plant life.
In general, trees of this type are satisfied with the rains, although it is good to water them regularly and in abundance for a few years after planting.For spontaneous growth, the Sequoiadendron giganteum plants prefer a soil that allows them to retain part of the water obtained from the snow, in order to have the correct humidity during the summer season. Fog can also provide a part of the moisture needed for the growth of giant sequoia.Ground
As for the ideal substrate for giant sequoia, it is advisable to place the redwoods in rich, well-drained, loose and very deep soil.
It is good that the soil retains some of the moisture provided by rain and snow, but does not allow the formation of radical stagnation that can be dangerous.
in late summer you can practice semi-woody cuttings; the redwoods can also be propagated by seed, the small seeds must be kept in water for at least one day, and therefore they must be kept in the refrigerator for 40-50 days before being able to sow them; young seedlings should be kept in a place protected from the sun and watered regularly. When the new specimens of giant sequoia have reached 30 cm in height, these can be placed definitively in the open ground, in the spring season or in early summer, to limit too rapid growth.
Giant Sequoia - Sequoiadendron giganteum: Pests and diseases
in general these trees are very resistant and are not affected by pests or diseases.