Felled cut stumps re-sprout creating a new crop and the live root system continues to hold the hillside together.
In California, repeated flooding has deposited 9.1 metes of silt in a redwood stand, which has adapted by growing a new root system after each deposition.
In Northern California redwoods grow on all aspects up to 1000 meters. Height and volume decrease due to dryness, exposure and altitude, while new growth is harmed by out of season frosts. They are largely unaffected by snowfalls. Do not tolerate direct salt laden winds and sites exposed to persistent strong winds.
Californian data shows gross volumes of stem biomass, ranging from 1,330 to 3,461 m3 /ha. A 90-year-old stand near Taumarunui is reported to have a basal area three times greater than measured in Pinus radiata.
Redwoods are showing very vigorous growth planted into cut-over Pinus radiata sites, beneficial conifer mycorrhizal root fungi being well established.
In California redwoods grow mixed with Douglas fir. A good combination for permanent cover forestry with selective logging options.
Wind firm and withstands fire
Redwoods survive severe wind storm events better that most other species. The late Bill Gimblett, forester of Hawkes Bay, spoke of a four-year-old planting burnt in 1932 and then over planted with Douglas fir. All the redwoods re-sprouted from ground level and became the dominant crop. Later the Douglas fir were commercially thinned and some years later a cyclone flattened the remaining Douglas fir, not a single redwood went down. The redwoods trunks were brushed clear of branches to 25 metres.