Hello Clueless. I don't know anything about sunflowers but if you have put your back out I can really recommend that you try Iyengar yoga. No, don't laugh. My husband is the last person on earth to try anything resembling spiritual matters etc but he suffered with back problems for years. Tried osteopaths, massage, pills, bed rest, the lot. Sometimes he was in tears with the pain. Finally his doctor suggested Iyengar yoga. He went to classes but you can follow instructions in a book. It's all about stretching and relaxing. He did the exercises regularly (every day) for about six months and was fixed. Now, if he feels a twinge, he does them again for a few days and has no more pain.
I have had back problems too. It takes one to know one, as they say. You have my sincere sympathy. I hope you feel better soon.