Spring is creeping upon us here in the Front Range, and if you plan to start any of your flowering, perennial, native, or woody plants from seed, they may require some special treatment to overcome dormancy and germinate. There are two general types of seed dormancy: mechanical and chemical. Mechanical dormancy refers to a seed coat that is impermeable to water and or air, and it must be broken by a process called scarification. Chemical dormancy involves chemicals in the seed that must be leached away or broken down by a method called stratification.