Sunflower seedlings can survive with the removal of cotyledons but early growth can be stunted.

Expected outcome of the corn treatments - From left to right: Control, one cotyledon clipped, two cotyledons clipped, epicotyl clipped, and severed at the hypocotyl.

Expected outcome of the corn treatments - From left to right: Control, clipped at 7 days after emergence, clipped at 14 days, and clipped at 21 days.