RE: when is too late??
I plant WGF sorghum 95 days before I want to hunt it (for deer, no pheasants).
I plant peredovik sunflowers btw 5 and 8 May for our dove opener on 1 Sept. I want to bushhog some rows so the dove are using the fields for a few weeks before the season opens (legal here to bushhog the sunflower rows as part of normal agricultural practices).
-fsh