Doug..
A good book you might want to check out...
On the forum here we usually refer to it as Scott's book or Scott Persons book.
www.amazon.com/Growing-Marketing-Goldens...rds=W.+Scott+Persons
He recommends planting 4-5 seeds per sq ft, in rake and scatter method.
25' x 25' = 625 sf
At 4 seeds per sq ft that would be 2500 seeds.
My experience has been that planting it that thick, you are very likely to have disease issues. So I would recommend leaning towards the less dense side. I would even go as low as 1 or 2 seeds per sq ft if planting large blocks.
Or.. instead of planting in large blocks (like one large 25x25 square) I would recommend breaking that up into several smaller plantings.
For example, do one 4x4 square, and plant that, then leave some unplanted space (like 3-4 ft), and do another 4x4 square.
The more densely you plant it, and the larger the blocks you plant, the more likely disease issues will show up.
I think the best time to plant stratified seed is a week or two before leaves fall which is Mid October for me. I try to get some planted then, but I am still hunting wild seng at that time... so I can't plant much then. Then I plant more around Thanksgiving. I get a couple days off work then.
I have tried planting in Dec and January but had poor germination results and now stick to planting in October and November only.
Good Luck !
TNhunter