From The Buffalo Seed Company:
"SNAPDRAGON (Antirrhinum majus) DESCRIPTION—This snapdragon gives you an array of vibrant colors that will elevate your spirit. Can reach three feet tall. Photo by Sara Worcester.
 
GROWING INSTRUCTIONS—Transplant. Start indoors 6-12 weeks before last frost. Sow several seeds per cell and lightly cover with soil. Keep soil moist and at 70F. Once soil warms, transplant seedlings outside 12" apart."