Gaillardia Commotion 'Moxie' is a blanket flower with warm yellow fluted petals around orange-red centres. Mounds of colour all summer long.
'Colorado Gold' is an unusual, super hardy Gazania with narrow, dark green foliage and large, bright yellow, daisy-like flowers.
Gelsemium 'Margarita' is a hardy Carolina jessamine with masses of large, bright yellow flowers on a semi-evergreen vine.
'Tequila Sunrise' is a Geum with semi-double flowers with lemony yellow petals and flushes and edges of rose-red.
Geum Tempo Yellow produces multicoloured, semi-double flowers in shades of pink, peach, yellow, and creamy yellow all at the same time.
Gladiolus primulinus 'Las Vegas' is a hardy glad with yellow funnel-shaped flowers with broad orange-red borders.
Gladiolus 'Goldrush' has delicately ruffled yellow blooms edged with an orange-coppery glow.
Globba schomburgkii has large, dark green, tropical leaves and large, golden yellow clusters of branched, ginger-like flowers.
Gloriosa lutea has pale lemon-yellow flowers that are crisped on the edges and turn orange-yellow as they age.