Although the Giant Sequoia tree (Giant Redwood) and Coastal Sequoia tree (Coastal Redwood) are the largest trees on earth, they can also be grown as a bonsai tree. This requires the necessary knowledge, attention and patience. This also applies to the Metasequoia. Growing bonsai's is a specialist field. If you want to know more about this, you can find more information on the Bonsai technique on the internet, for instance on the Wikipedia page on Bonsai.