500 seeds. Nicotiana langsdorffii. Tender Perennial grown as annual. 
 
Nicotiana langdorffii 'Lemon Tree' has small yellow-green flowers on tall stems. Hardy in zones 10 and 11.
 
Height 3 feet.  Spacing 12 inches.
 
Sowing Nicotiana Seeds: 
 
Start seeds indoors 6-8 weeks before the last frost date. Sow on the surface of the soil. Full sun to part shade.