English isn't my native language, so I may made some lexical and grammar mistakes: please forgive me!
Coast redwoods (the most common type of sequoias) have a conical crown, with horizontal to slightly drooping branches. The bark is very thick, up to 30 cm (12 in), and quite soft, fibrous with a bright red-brown when freshly exposed (hence the name redwood), weathering darker. The root system is composed of shallow, wide-spreading lateral roots.
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In the national park of redwood the esemplar Imperyon has reach 115,55 m of height. Those trees have a 15m-diameter trunk.
They live only in humid coniferous forests, from Oregon to California.
Sequoias in Minecraft
Giant sequoias spawn only in forests near taiga, but you can plant their saplings everywhere.
In minecraft a tree big as a mountain and that is higher than the maximum height (unless this feature will be changend) is maybe no possible. Ok, but the bigger tree in minecraft is high less than 10 block... so I say no: there is something wrong
A tree of those dimensions don't spawn near other trees from today to tomorrow. Sequoia can spawn after the world's creation only like sapling that are high two blocks. But let's see how are default sequioas tree
1° type - uncommon 4x14
2°type - common 8x24
3°type - uncommon 36x49
The first three types of sequioias
4°type - rare 66x70 - if seventy block is too much for map height it can be 60
5°type - ultrarare 157x90or100or110 - this epic tree can spawn only in a very high map, and near to it there are a lot of aggressive ents and wild animals that immediately attack you
Growing fertilized sequoias
Giant sequoias, to reach the height of 14 m (or blocks, is the same), must have a lot of years. So, how we can plant sequoia's saplings? Simple: let's use fertilizers like bone meal. But at lot of time, of course. You can fertilize this trees with right click on a log top (or cortex, see section below) of the tree. Fertilizing should not be continuous, the number of the days is the total ammount.
You must start from a sapling, default trees don't will grow.
Is necessary go out to the map range for the growth from a sequoia's type to another one
Blocks (tree too) too close at the sequoia will be destroyed at the grow time if they hamper the growth area
If you hurt sequoia's log (not cortex or leaves) the tree will never grow more
Sapling-->after 5 days of daily fertilizing-->1° type
1°type-->after other 7 days of daily fertilizing-->2° type
2°type--> after other 10 days of daily fertilizing-->3°type
3°type--> after other 20 days of daily fertilizing-->4°type
4°type--> after other 40 days of daily fertilizing-->5°type
Cortex and core
In the images of the section of the sequoia's trunk, there is an important element of the tree: cortex.
Sequoia's cortex is lighter than normal (it look like ocher), and fragile like leaves block. It's a new block that spawn a stick when chopped.
Sequoia's log is a very bad wood. Sequoia's log can be crafted only to produce x2 stick, like normal log and wood. Chop sequoia's log is quicker than chop other logs.
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Everything better explained
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