Snapdragon Flower Growing Season. 25042021 Height of the snapdragon may reach 3 feet 1 m or as short as 6 inches 15 cm. Some summers may be too hot and dry for normal performance.
Some summers may be too hot and dry for normal performance. Snapdragons are slow-starters that germinate best in cool temperatures. The plants grow to a height of 6 inches to 48 inches depending on their variety.
Some years it may be hardy through the winter.
Choose a location with full sun. Some varieties can grow tall enough to need staking. How to Grow Snapdragons. 04052021 Cultivation and History Snapdragon thrives in the cool late spring to early summer portion of the growing season.