Brickman,
Soybeans were brought to the US as a forage crop. Over time, breeders have bred soybeans to produce more seed than forage. We have introduced and selected forage types and added the Roundup Ready gene. These include tall, bushy types and viny, runner types like Quail Haven. These are also late maturing which maximizes your summer plot attractiveness. Farmers are growing earlier soybean which allows them to harvest when fields are drier and require less tillage for the next crop. It used to be normal to harvest up to Thanksgiving and rut the crop out. In LA, you have a much longer season and can plant earlier and later than in the north. You can plant soybean through September, you will just have a shorter plant than planted earlier. Once frost hits green leaves, the leaves are not as tasty, until extreme cold temps hit. I will post some pics soon.