20 or so,i picked the seed pods,dried them in our greenhouse and put a whole pods worth in each envelope.each seed makes a plant and each plant gets about 100 seeds so i'm putting a lot on here,it helps save the monarch butterfly.the flowers bloom purple and your yard or garden or field will smell beautiful .
they will come back every year,if you let the plants go to seed,they will blow everywhere and spread out.easiest to take care of because nature takes care of the rest :-)but if you don't want them to go to seed,just pick the pods and dry them for a good long while til the pod turns brown,then you can plant even more or control the area,we let ours blow everywhere and our fields get full and smell so pretty.