Propagation Environment: Greenhouse made of standard U.V. 3HL Clear 6mil from (J.R. Johnson Supply Inc.). Fans run continuously to circulate the air. Vents open during the summer months for cooling. Container Type: swamp milkweed grows best in 14"x8.5" trays having 24 cells, each cell being 2" in diameter and 4" deep. Growing Media: Scotts Redi-earth Plug and Seedling Mix. Contains vermiculite, and sphagnum peat moss. Soil is sterile.
Add enough water to the soil to saturate. Mix soil with a trowel. Cover the holes in the bottom/sides of the plug tray cells with newspaper, as the soil will fall through. Fill cells with damp soil and press soil down with a spoon. Refill the cells plugs with soil to the top, this time not pressing it down. Thoroughly moisten soil in the plug cells, but do not saturate. Sow the seeds by hand at a rate of about 3 seeds in each cell. Cover the seeds with a thin layer of soil or gently press the seeds into the dirt. Sow January thru July.