Sentence:  Other flowers we might gather as we pleased : myrtle and white violets from beneath the lilacs ; the lilacs themselves , that bloomed <WSD>so</WSD> prodigally but for the most part beyond our reach ; snowballs ; hollyhock blossoms that , turned upside down , make pink petticoated ladies ; and the little , dark blue larkspur that scattered its seed everywhere . 
Meaning of the word marked with <WSD> tags:  to a very great extent or degree