Voodoo Flowering Maple. Of course, not a maple it all, this close Hibiscus relative is one of the longest flowering plants in our garden. It will begin to flower for us in spring and will continue into fall, even into the upper 20's. It will reach a height of up to 6' and ours remain green down into the low 20's. Give it part shade to full sun and you want be disappointed. Grow in average garden soil.