CHASTETREE 'SHOAL CREEK'*Vitex agnus-castus 'Shoal Creek (3-gal.) CHASTETREE 'SHOAL CREEK'*Vitex agnus-castus 'Shoal Creek Tree ranging from just a few feet tall to more than 15 ft. in height. Flowers: Showy Flowers, Fragrant Flowers Wildlife: Attracts Butterflies Full sun to Zones 6-9.