Echinacea angustifolia Seeding Rates

I am interested in ordering Echinacea augustfolia. I need to know how much it would take to plant an acre and are your seeds already stored at the cool temp it takes them to germinate?

It takes 6 to 8 Kilograms of seed per acre, but sowing in plugs or a seed bed would be recommended for far better survival. You need 10 grams per 1000 plants for plug production.
Our seed is cold stored, but not stratified. You have to place it into MOIST sand at 5 degrees Celsius for 90 days to break dormancy. You could also add Ethrel to the stratifying seed and plant out as soon germination begins.
Consult the Pro-Growers box in our catalogue and the Q&A section on our web-page (www.richters.com) for more details.