You can be sure that all plants need water. However, some plants are able to resist drought better than others. The means by which plants cope with drought varies considerably and impacts how we should use these plants in the landscape. Some plant are "drought tolerant" simply due to an extensive root system, but will suffer if planted where the roots are restricted in the landscape or reduced during transplanting. Other plants are able to conserve water due to limited leaf areas, have leaves that prevent water loss, or can tolerate extreme dehydration.