They also sprout from their own stump or roots. They can sprout new trunks from tissue in their root collars called burl. This growth only occurs when damage has been done to the tree. Root sprouts also can form from burls. This is beneficial after floods when sediment can collect several feet deep.
Redwoods can resist many elements that cause most trees to fall.
They are resistant to fire, insects and rot. Fires around the base of the trees actually aid in their continued reproduction. Fire clears the ground of understory, replinishes nutrients and allows sunlight to reach the ground. All of these factors help seeds to grow. Over the years we have allowed the numbers of Redwood old growth to fall drastically.