We have a wondrous abundance of flowers this year. Some of the plants have 9 flowers growing from one stalk. Normally I will plant one seed per hole and spaced about 8 inches apart. This year I was in a hurry to get some planted so I grabbed a handful (20 stalks are growing clustered together), placed them in some dirt and covered them; then went on vacation for two weeks. I have spent a lot of time fertilizing and watering and it certainly paid off. Now for the harvest before the birds and squirrels seek them out. Thank you for the idea regarding covering the heads, and for the information on hanging them to dry. I look forward to your response regarding the ants.
Ants won't hurt flowers. They may be "herding" aphids so they can eat their honeydew, but the aphids are the unwanted bug, not the ants. Check for soft-bodied insects on the underside of leaves or petals. Damage will be apparent. Sevin works on aphids, or a strong stream of water, even squishing by hand can be effective if there aren't too many. If you don't see aphids or plant damage, leave the ants alone - they are generally benign.
Ants do not like mint (any type of mint) so you could plant some pots of this into the ground. I suggest doing it this way because mint can be invasive. Also, ants do not like marigold so you may consider planting some amongst your sunflowers. African marigolds are about a foot or so high and have beautiful large blooms. Marigolds also help greatly to keep aphids away.
You may find companion planting very helpful, Just type it into search, you'll be amazed with what you'll learn about using other plants to cope with problems in the garden. Have fun!
Look for Terro Outdoor Ant Killer granules. Follow the directions on the bag. Places like Lowe's or any garden supply store will have it.
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