Hot Long Red Cayenne Organic Pepper Seeds. Heirloom Vegetable. This pepper produces long, slender, wrinkled peppers, 12 cm x 1.25 cm (5″ x 1/2″) in size on plants that grow to 75 cm (30″) in height. While the spicy, hot peppers can be harvested green, they are best left on the plant to mature to an irresistible red. They are also an excellent pepper for drying. Is your mouth watering yet? Scoville Heat Unit Rating – 4000.