Sunflowers are perennials. When they are happy, they return year after year to perform their magic. They also multiply by underground suckers. Take this into consideration before planting them. Purchase a few plants and let them fill in the holes. If they are not happy and perish, you have not wasted much money. And, if they multiply a bit more than you expected, you can give them to friends. Let the suckers become well established, dig them up with a small trowel and repot them so they can establish a good root system before they are transplanted elsewhere.
Resindot sunflower is a resident of the sandhill ecosystem. Sandhills are characterized by deep well-drained sandy soils and little tree-canopy shade. Plants of this community have to be tough and resilient to survive. In particular, they must be adapted to low fertility, occasional drought, and full sun.
Resindot sunflower makes a commanding presence in this community. Full-grown specimens may reach 6 feet in height and have more than a dozen blooms open at any time. In our Pinellas County landscape, the resindot sunflowers are now two years planted after growing them from seed. They are one of the first of our wildflowers to appear in the spring - after a short dormancy underground - and they begin flowering by mid-June. They then keep blooming until late fall.
Our plants have produced suckers in our garden, but they have spread very slowly compared to the wetland species we also grow. The plants we offer for sale are grown from seed produced each year in our landscape. These first-year plants will bloom, but they will not reach their full potential until the following year's growing cycle.