The very first plants on land were tiny. This was a very long time ago, about 470 million years ago. Then around 350 million years ago, many different kinds of small plants started evolving into trees. These made the first great forests of the world.

When did the first tree appear on Earth?

Cladoxylopsida were the first large trees to appear on Earth, arising almost 400 million years ago in the Devonian period.

Did trees exist with dinosaurs?

During the Mesozoic Era, when the dinosaurs lived, conifers dominated the landscape. These slow-growing evergreen trees and shrubs probably constituted the majority of the herbivorous dinosaurs' diets. Conifers were probably important food for dinosaurs, including the large sauropods.