A perennial is a plant whose root goes dormant in the winter and revives and grows again every year.  The advantages are you don't have to plant every year.  Plants usually grow and expand so that every few year you can divide one plant into several that can be planted elsewhere or shared with a friend.  (Occasionally, a perennial will have a single tap root that can't be divided; we note that in the individual plant information.)  The disadvantages to perennials are that you have limited bloom time throughout the summer and some yearly maintenance is required.  Perennial gardens usually evolve over time--be patient and know that you can always move the plant somewhere else next year! 

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Botanical Name Common Name
Botanical Name     Common Name