Time to mix up the sawdust, sand and perlite that will be used as our growing medium in our seedling flats. We mixed 4 parts sawdust, 2 parts sand and 1/2 part perlite for our seedling flat, as seen in the pictures below.
Seedling flats are shown in the Mittleider Gardening Course book on page 181. The dimensions of the seedling flats are 18″ x 18″ x 2 1/2″. Once filled with the mixed growing medium we added 1 1/2 ounces of our pre plant fertilizer mix. (Page 51 in the MGM)