Question: what are quick growing shrubs?
Answer: North Privet. Ligustrum x ibolium. This deciduous or semi-evergreen shrub is America's fasting-growing hedge, growing up to 3′ per year. ... 
Forsythia. Forsythia x intermedia. ... 
Crapemyrtle. Lagerstroemia indica. ... 
Beautybush. Kolkwitzia amabilis. ... 
American Hazelnut. Corylus americana. ... 
Pee Gee Hydrangea. Hydrangea paniculata 'Grandiflora'