soar redwood are the kings of some westerly timberland . name for their red wood and barque , the tannin that give redwoods their hue also protect against most insect , which do n’t like its taste . The tannins also help protect the trees against kingdom Fungi and fire .
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Three tree diagram coinage are referred to as sequoia . The coast redwood ( Sequoia sempervirens ) , audacious in U.S. Department of Agriculture plant hardiness geographical zone 7 through 10a , are behemoth of the California coast , and some pocket of the trees can also be found along the seacoast of southern Oregon . The gargantuan Sequoia ( Sequoiadendron giganteum ) grows in California ’s Sierra Nevada spate and is hardy in USDA zona through 8 . Both trees strain skyscraper peak of 300 foot or more with monumental diameter of 20 to 25 feet . Some are more than 2,000 years old . The third sort of sequoia is the morning sequoia ( Metasequoia glyptostroboides ) , a indigene of northern China that grows in USDA zone 5 to 8 . Much smaller than its California first cousin , the dawn redwood grow 75 to 100 metrical unit tall and , unlike the larger redwoods , is deciduous .
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Insect Resistance
Most insects find the gustatory modality of tannins bitter and steer clear of trees with high tightness of this chemical . Tannins are also toxic to worm . They bind to proteins in an insect ’s saliva as well as digestive enzyme , stamp down the its ability to digest plant proteins . Insects that ingest tannin ca n’t gain weight , and some pall . onetime trees have more tannin than immature ones , as the chemical compound accumulates over the C .
Insect Pests
Despite the fact that the trees are n’t prone to much dirt ball equipment casualty , some bug can bother redwood . Insects that can cause problems admit two sort of armored scales , the black araucaria scurf and the sequoia exfoliation . Bark beetle pest include the cedar and cypress bark beetle and redwood bark mallet . In gain , the cypress tip miner and titivate wanderer mite can do damage to sequoia .
Fire and Fungi Resistant
In addition to repelling dirt ball plague , sequoia trees are also naturally arouse and fungi resistant . The trees ' thick , moist bark often maintain the tree trunk from catching fire , while redwoods control niggling inflammable pitch , unlike fir and pine tree . now and again , fervor will climb up the trunk of a redwood tree diagram and burn the crown , while pass on the barque relatively unhurt . Fungi often take up home in the rot areas of Sir Herbert Beerbohm Tree damaged by flak , but since redwood are largely imperviable to most fires , fungi commonly never get a toehold .
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