If you wait you can get little ones from the big ones, I have them all over the place, just under the mother plant. Karen in Maryland
if you want identical plants than cuttings will work. they donot set seeds in my part of florida and only usually bloom twice a year i am midstate west coast. i would imagine that further north they would bloom more steady thru the summer. but if you'res do set seeds than planting those should give you a flowering plant in 2 to 5 years. depending on what types you and you're neibors around you have, might make the blooms way different with cross pollinitation but again i have never grown the rose of sharon from seeds. i dought they vary as widely as there cousins the tropical hibiscus do