Now in order to achieve perfect virescence effect as quickly as possible,all cities begin to inseminate great specification nursery stock .Expecially for preparing the Olympic hold in Beijing in 2008 and the World exposition hold in Shanghai in 2010.The nursery stock which uesed for virescence in these cities almost are Great Specification.Therefor,the arbor which dosage is largest such as southern magnolia,Ceda,camphor,Gingkgo etc. and the nursery stocks which Specification are over 6mm are shortage.The expert analyzed ,in the following days ,the great Specification nursery stock will be the market shopping-rush goods. At that time, who have the great Specification good nursery stock which needed in the garden virescence ,who will be the largest winner.