Do these flowers grow petals from the center disk?
Certified GKH Gardening Expert
Yes, some varieties do. It just depends on which one you have. Here is an article for further care: https://www.gardeningknowhow.com/ornamental/flowers/gerbera-daisy/growing-gerbera-daisies.htm
Gerbera daisy do not usually develop petals from the center disk. Fasciation is a term for unusual growth, including petals, and you can find pictures on the internet. Aster yellows is a disease that can cause abnormal growth/petals. It affects traditional daisies but I didn't see reference to Gerbera. Here is a link some infected daisy images: https://www.google.com/search?q=aster+yellows+disease+on+daisies&client=safari&rls=en&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjJ3Jqt_-vWAhWM5IMKHW1dBhUQ_AUICigB&biw=1689&bih=896