The Forestborn Peloran were designed with plant DNA and chlorophyll so they could absorb energy from the sun. This was because the Peloran wished to have soldiers who could survive even when cut off from supplies for long periods of time. They also inserted a healing trance capability into the Peloran codex that could be triggered by a simple command at any time. That allows the Forestborn to sleep for hours, days, or however long it takes to heal their injuries via the energy they gain from the sun. It also allows them to go to sleep and simply remain in that position until they are needed. Days, months, or years later. Or more. Forests can and have grown up around them as they sleep. Which has led to legends of the very trees coming to life and engaging in battle. Not to worry. It is not the trees. That is the Forestborn waking up when they are called and going into battle.