32 Blue Vervain Gardening Tips And Facts
dispirited vervain ( Verbena hastata ) is a repeated herbaceous plant that can be find out in wet meadows , prairie , and alog roadsides and streams in North America . The works has hearty stems and can grow up to four feet tall . Its leaves are opposite , fishgig - shaped , and serrate . The plant produces small blue flush that blossom in summer and early capitulation ....