Did a throw and mow of sunflowers in June. There was winter rye growing there at the time. I sprayed, broadcast, and mowed the rye down on top. No fertilizer applied. Got good germination, but lots of marestail and grass came up as well. Browsing was pretty light, with about 1/3 of the sunflowers having the tops browsed off. Last week I chopped the tops of the marestail off, or pulled it up, to prevent seed set. Sunflowers are about 3 foot tall with 2 or 3 inch heads.
At the same time I broadcast those, I planted a row in my garden. Garden was fertilized with composted horse manure, was watered when necessary, and weeded. These grew 6 feet tall, with either a single 12" head, or several 4 or 5 inch heads.
I didn't expect there to be quite this much difference between the two. I guess I'll worry a little more about fertilizing my plots in the future.

At the same time I broadcast those, I planted a row in my garden. Garden was fertilized with composted horse manure, was watered when necessary, and weeded. These grew 6 feet tall, with either a single 12" head, or several 4 or 5 inch heads.

I didn't expect there to be quite this much difference between the two. I guess I'll worry a little more about fertilizing my plots in the future.