Ginkgo

A mutation, or a series of related mutations, eventually create a very hard wood which you can use to grow very tall indeed.  Ginkgo trees can reach as high as 100m - three times the size of the average house.

Once, back in the Jurassic era, there were many varieties of Ginkgo, but in the intervening millennia they have been outcompeted by other plants and now only one species remains.  The Ginkgo tree is only found in the wild in areas of China.

That's as far as you can evolve here!  

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