Time Tree

The Time Tree was a tree which enabled time travel. It was possible to time travel simply by plucking its seeds (which grew into other time trees). It had orange coloured leaves. They had an appetite for heavy metals. However the method of time travel was not exact, one seed could take someone back a 1000 years, another seed could go back 10,000. (EDA: Genocide)

The Doctor guessed that the Faction Paradox created (and planted) the trees.

They originated on the planet Hirath. (EDA: Longest Day)