While each individual species has its own peculiarities, the cultivation of all cereal crops is similar. Most are annual plants; consequently one planting yields one harvest. Wheat, rye, triticale, oats, barley, and spelt are the “cool-season” cereals. These are hardy plants that grow well in moderate weather and cease to grow in hot weather (approximately 30 °C [86 °F], but this varies by species and variety).