Seeds are formed from the flower. After the flower fades the seeds are produced. When the flower stems drys cut it off and put it in a paper bag and the seeds will fall out and you will need to find them and separate from the chafe. Seed identification sites are available on the internet to show you what the seed looks like. Some named plants are hybrids not producing viable seeds so you should check. In our climate I take cuttings to expand plantings. Al

Okay how do you now get results with planting the seed, you told us how to harvest them what next. Please and thank you. Norma

norma if you want to grow from seed, you need to know all seed can not be treated the same. Many will have ways to prevent germination until conditions are right for their growth. There are sites on line with germination data bases, which will tell you how to treat most seeds before planting, including best temperature for germination. Al