If they grew wildly and some of the seeds fell to the ground, it is possible that they will grow back again.
To help this happen and if all possible, check to see if there were any seeds that fell to the ground around the sunflowers or harvest some from the flower if possible.
If you do find or harvest some, I suggest digging small holes about 2-3 inches deep and about 6-9 inches apart, dropping seeds in there.
I stagger my rows and as they grow, you may find that some flowers are not as strong and keeping up. I usually end up removing about 25% of the young flowers and will either try to transplant them or grind them up and use as fertilizer for the remaining sunflowers. I believe that this helps the healthy sunflowers thrive more.
Be sure to water the young seedlings once a day and never directly on top of them. I soak around the flower bed and in the rows between where I planted and will occasionally add some sort of diluted fertilizer maybe once a week during the early stages. As the flowers mature, they won't need to be watered as frequently (unless drought) and it is suggested that mature sunflowers need watering once or twice a week with a decent soaking and again, never on or at the base of the flowers but about 12 inches away from the stems so that you are soaking the roots.
Over the course of the spring and summer, I plant and grow about 100 sunflowers and throughout the season due to culling, weather, critters, or other reasons, will lose about half of the lot. It kind of sucks losing so many but the ones that are remaining, they look great. They line my side yard along the fence and I get compliments all summer long.
On average, I usually get sunflowers 6-8 feet tall with the occasional 10+ footers. The tallest one I ever had came in at 12 feet-2 inches.
If they grew wildly and some of the seeds fell to the ground, it is possible that they will grow back again.
To help this happen and if all possible, check to see if there were any seeds that fell to the ground around the sunflowers or harvest some from the flower if possible.
If you do find or harvest some, I suggest digging small holes about 2-3 inches deep and about 6-9 inches apart, dropping seeds in there.
I stagger my rows and as they grow, you may find that some flowers are not as strong and keeping up. I usually end up removing about 25% of the young flowers and will either try to transplant them or grind them up and use as fertilizer for the remaining sunflowers. I believe that this helps the healthy sunflowers thrive more.
Be sure to water the young seedlings once a day and never directly on top of them. I soak around the flower bed and in the rows between where I planted and will occasionally add some sort of diluted fertilizer maybe once a week during the early stages. As the flowers mature, they won't need to be watered as frequently (unless drought) and it is suggested that mature sunflowers need watering once or twice a week with a decent soaking and again, never on or at the base of the flowers but about 12 inches away from the stems so that you are soaking the roots.
Over the course of the spring and summer, I plant and grow about 100 sunflowers and throughout the season due to culling, weather, critters, or other reasons, will lose about half of the lot. It kind of sucks losing so many but the ones that are remaining, they look great. They line my side yard along the fence and I get compliments all summer long.
On average, I usually get sunflowers 6-8 feet tall with the occasional 10+ footers. The tallest one I ever had came in at 12 feet-2 inches.
Hopefully this helps and good luck!