I just leave them standing until the fall rains start, then cut the heads and keep them in the garage. The birds know how to extract the seeds, no need to do that for them, unless you are wanting seed to fill your feeder.
Natalie Manor wrote:I have the same dream about the sunflowers. The land I am looking at is mostly flat so I was going to do berms with sun flowers the first year. The finch's go crazy for the seeds still on the flower. Fun to watch. Do you just let the flowers filled with seed fall to the ground or do you break them up and spread? When you grow for your birds, do you deseed the flower or just cut the flower head for the birds? Thanks.