Hydrangea pan. 'Limelight' (Limelight Hydrangea)Lime green flowers starting mid August Vigorous and floriferous Large, snowball shaped clusters of flowers Get ready for a revolutionary new member of the Hydrangea family! 'Limelight' will take your breath away with its unique lime green flowers that cover the plant in big, poofy snowballs starting in mid August. Very vigorous and very floriferous, this is just the plant to inject excitement into the late summer landscape. Hardiness Zone 3 9 Height 6