Rose mallow, Hibiscus syriacus 'Blue Bird', purple blue buds opening among green leaves on a shrub.

Rose mallow, Hibiscus syriacus 'Blue Bird', purple blue flower and bud growing on a shrub against a green background.

Rose mallow, Hibiscus syriacus 'Blue Bird', single purple blue flower growing on a shrub.

Rose mallow, Hibiscus syriacus 'Blue Bird', purple blue flower and buds growing on a shrub against a green background.

Rose mallow, Hibiscus syriacus 'Blue Bird', single purple blue flower growing on a shrub against a green background.

Rose mallow, Hibiscus syriacus 'Blue Bird', purple blue bud opening among green leaves on a shrub.

Rose mallow, Hibiscus syriacus 'Blue Bird', purple blue buds opening among green leaves on a shrub.