Britannica Sources used in this answer

How do buried seeds help an ecosystem recover after a wildfire?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

ecological disturbance caused by forest fire — ecological disturbance Aerial view of the remains of trees on a hillside after a forest fire.

Buried seeds, known as a soil seed bank, serve as a vital survival mechanism for many plants in ecosystems prone to wildfire. These seeds remain dormant in the soil for years, acting as a reserve that allows populations to recover after a disturbance.12

In fire-prone environments, such as those with Mediterranean climates, many species have evolved to rely on specific fire-related cues to break this dormancy. These signals include:1

Heat pulses: Exposure to high temperatures, such as the 90° to 95° C (194° to 203° F) required by some species, can trigger germination.2
Chemical signals: Compounds found in smoke or charred plant matter can stimulate seeds to sprout.32

Once these conditions are met, the seeds germinate en masse, often in the spring following a fire. This process is ecologically significant because it allows plants to take advantage of the post-fire environment, where competition from other plants is reduced and the soil has been temporarily enriched by ash. By maintaining these persistent seed banks, plants ensure the long-term stability of their populations even when above-ground individuals are destroyed.12