Yellow or purple flowers with a large, round puff of pollen at the center are called sneezeweed. They grow wild in many parts of the United States and are now being cultivated for use in home gardens. Their bright colors and rich pollen attract bees and butterflies throughout the year. They do best in moist soil and usually grow on the perimeter of lakes and ponds. You should move potted sneezeweed indoors for the winter.
Add compost to soil. Before the first frost, mix fresh compost into the soil to give your sneezeweed a boost of nutrients and a healthy start in winter.
Cut back stems. After the first frost, sneezeweed will shed its flowers. Snip the upright stems and seed heads down to the lower ring of leaves called the "rosette."
Spread mulch. Add a 2- to 3-inch layer of mulch around the base of your sneezeweed to help keep ground heat close to the roots of the plant.
Remove dead leaves. In early spring, snip off any brown or yellow leaves on the rosette.
Fertilize. As soon as spring arrives, spread an evenly balanced fertilizer on the soil of your Sneezeweed to encourage rapid growth. Hopefully the plants will have survived winter and will quickly put out new leaves and blooms.