The Biology of Drought in Trees

To survive a drought, a tree undergoes complex biological changes at a cellular level. Under normal conditions, microscopic pores on leaves called stomata open to take in carbon dioxide, losing water vapor in the process. When water becomes scarce, the tree produces stress hormones that force these stomata to close, conserving precious internal moisture. However, this defense mechanism also shuts down photosynthesis, forcing the tree to deplete its stored starch reserves just to stay alive. If the dry spell persists, the water columns inside the tree's vascular system can snap, causing lethal embolisms that permanently destroy tissue. Protecting this fragile tree biology during a drought requires specialized Denver plant health care knowledge. Ensuring your tree root system receives deep, targeted watering helps maintain the vascular pressure needed to prevent cell death. A certified Denver tree specialist can evaluate these biological markers to build a custom recovery plan.