I have flower seeds from my plants to give away. For anyone who wants some, PM me your name and a mailing address. I usually get them sent out within 2 weeks of receiving a request. I'm linking photos to the two varieties of seeds I have.
Purple Coneflower- perrenial, heat-tolerant, good pollen plant for bees, and good butterfly plant.
False Sunflower - annual (to the best of my knowledge, this is the name of the yellow flowering plant.) The yellow flowering plant in the link photo is one single plant. In good soil, they get really big and have lots of flowers, but beware they reseed freely, so they need to be dead-headed after flowering if you don't want lots of plants coming up the next year. They are good butterfly plants, and a good pollen source for honeybees in late summer and fall. These are heat-tolerant and bloom during the heat of summer and into the fall.