First Plant Species on Earth Revealed

Curious Kids explores the origins of plant life on our planet

Mar. 17, 2026 at 12:22am

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Around 500 million years ago, most of Earth's surface was bare rock and dry soil, with life existing almost entirely in the oceans. Then something amazing happened - plants began to grow on land, marking one of the most important events in Earth's history. This article traces the evolution of plants, from simple algae in the water to the diverse flora we see today, and how their development transformed the planet.

Why it matters

The emergence of plants on land was a pivotal moment that changed the planet forever. As plants evolved and spread, they released oxygen into the atmosphere, created soil, and established new habitats and food sources that allowed animals to move from the oceans onto land. Understanding the origins and evolution of plant life gives us insight into how our world was shaped over millions of years.

The details

The earliest plantlike organisms were simple, tiny green life-forms such as algae that lived in Earth's oceans and lakes for over 1 billion years. Around 470 million years ago, scientists believe the first true plants evolved from green algae and began adapting to life on land. These early plants faced new challenges like avoiding drying out and standing upright, so they evolved features like a waxy cuticle and stronger cell walls. Over time, plants developed vascular tissue to transport water and nutrients, allowing them to grow taller and spread across the landscape. The development of seeds around 380 million years ago was another major evolutionary step, protecting plant embryos and enabling reproduction without water.

  • Around 500 million years ago, most of Earth's surface was bare rock and dry soil.
  • Around 470 million years ago, the first true plants evolved from green algae.
  • Around 430 million years ago, fossils of early land plants like Cooksonia date back.
  • Around 420 million years ago, plants evolved vascular tissue to transport water and nutrients.
  • Around 360 million years ago, vast forests covered much of Earth.

The players

Erin Potter

A lecturer in Geography and Ph.D. student in Earth Sciences at Binghamton University, State University of New York, who studies changes in the diversity of flora and fauna over time.

Ivy

A 6-year-old from Phoenix who asked the question "What was the very first plant in the world?".

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What they’re saying

“Long before dinosaurs roamed the land, Earth looked very different from the planet we know today. Around 500 million years ago, most of Earth's surface was bare rock and dry soil. There were no trees, no grass and no flowers. Life existed almost entirely in the oceans.”

— Erin Potter, Lecturer in Geography and Ph.D. student in Earth Sciences

“Even though these plants were tiny, they had a huge impact on Earth. As plants spread across land, their roots helped break down rocks into soil, a process called weathering. This created richer soil that could support more life.”

— Erin Potter, Lecturer in Geography and Ph.D. student in Earth Sciences

The takeaway

The evolution of plants, from simple algae to the diverse flora we see today, was a transformative process that fundamentally changed the planet. By releasing oxygen, creating soil, and establishing new habitats, plants paved the way for the rise of complex life on land - including the eventual emergence of humans. Understanding this ancient history gives us a deeper appreciation for the vital role plants play in sustaining our world.