Verbena bonariensis is a great herbaceous perennial which grows up to around in height, seeding itself all over the place. Despite its height, it is not a dense plant and therefore can be planted anywhere in the border as you can see through it.
How to Plant Wildflower Seeds. Fall wildflower seed planting will give you an earlier blooming period than spring planting. Keep the soil, where wildflower seeds have been plated, moist during germination, but avoid overwatering after germination.