It grows to 4 m ( 13 ft ) tall by 3 m ( 10 ft ) wide .
It is a vigorous deciduous shrub , with plentiful matt green leaves and flat red or pink flowers , with yellow central stamens , in summer .
Growing to 4 m ( 13 ft ) tall by 3 m ( 10 ft ) wide , it is a vigorous deciduous shrub , with plentiful matt green leaves and flat red or pink flowers , with yellow central stamens , in summer .