Go right ahead! As a matter of fact, sunflowers are one of three or four I might reseed all season long. This is also fine for marigolds and balsam impatiens. Otherwise, you get only get one bloom cycle for a short time. These will all grow and bloom very quickly and go on until frost. Let some go to seed and when you're deadheading, pick the seedheads, sprinkle them around and it'll keep on going.

I did a little research. It takes approx. 10-14 days for germination. Then it takes approx. 6-8 weeks for blooms. That means blooms no earlier than mid-September or October 1. We often get a first frost around Oct. 20-25. Yes, you may have time but you won't have much "hang time" with the blooms before frost. Maybe 4 weeks at the most.

I'm growing sunflowers for the first time, actually. this is the first time I've tried to actually grow something on my own. I picked off a couple of seeds from several sunflowers grown at a nearby school. These sunflowers were the 7' variety. Anyways. I had to take an emergency trip two weeks after my seeds sprouted. So I placed them in pots praying that they would live. I've been gone for almost 2 months and my sunflowers are showing signs of blossoms. These plants are barely 5 feet and the leaves and flowers look... well tiny, compared to their parents. I crowded them when I left placing 3 seedlings per pot. Would it be a good idea to place them further apart even though they might blossom any week now?... Do you have any suggestions...

You can sow them forever. The DTMs on the packages are estimates only and I have found many varieties flower much earlier here in our heat than the DTMs indicate. (This is true of many other kinds of annual flowers, herbs and veggies too.) I've sown sunflower seeds as late as early August and had flowers in the fall before frost. In a good year with adequate rainfall my sunflowers will form seeds, the seeds will fall to the ground and a few weeks later the seeds will germinate and give you a new round of plants. In addition to the sunflower seeds I plant, we have a couple of kinds of native sunflowers, including Maximilian's sunflower and they grow fine with no help from me. I don't even water them. Sunflowers are about the easiest thing on earth to grow. Sadly, deer will eat them....the flower while it is in bloom or after it has formed but not yet opened, the seed head, leaves, stems, etc., so how many sunflowers we have in bloom in any given year will depend on how hungry the deer are.