1-Warm soil temperatures allow for root growth and plants are well established once spring actually arrives. 

2-Rainfall tends to be more reliable and cooler temperatures mean there is far less time devoted to watering chores. 

3-This is the best time to dig and divide most spring and early summer blooming plants. 

Important Perennial Gardening Tips 

  • It is a good idea to use a protective winter mulch on newly planted beds (and established beds as well). 
  • Sterile straw, evergreen boughs or shredded leaves placed over the earth after the ground freezes helps protect the soil from repeated thaws and frost heaving. 
  • Remove the mulch (or other bed covering) once the weather promises reliable springtime temperatures.