What is the fastest growing flower? Any that takes a week or less from planting to full bloom?
Amaryllis, a bulb which flowers quite rapidly- in a week or two, may have a stem already growing when you buy it, I have had blooms in a couple of days from those. You will start finding them available as we get closer to Christmas, and it makes huge spectacular flowers. No flowers from seed will flower that quick. French Marigolds will take probably 3 weeks from sprouting with optimum growing conditions.