The poppy is an ancient flowering plant, long desired by gardeners in a range of landscape situations. Planting Poppies is simple and rewarding when their single and double blooms appear in cooler seasons. Poppy plant care involves the deadheading of spent flowers, resulting in more prolific blooms of the Poppy plant. Poppy flowers need limited watering once they have settled into their location. Too much water can result in tall, leggy, unattractive growth of the growing Poppy flower.