Tulipa 'Keizerskroon'. Red and yellow petals of Tulip scattered over rusty metal sheet filling camera frame.

Daffodil, Narcissus pseudonarcissus. Yellow daffodils growing together with purple and white Crocus.

Tomato, Lycopersicon esculentum 'Yellow plum'. Yellow flowers and green foliage of growing tomato plant.

Pumpkin, Cucurbita maxima 'Queensland Blue'. Green veined, yellow flower with developing fruit below.

Tulips in a row against a printed pattern background.

Digitally manipulated image of one red and one yellow leaf placed beside each other within a circle on softened, muted background creating the effect of illustration.

St Johns wort Hidcote. Cluster of bright yellow flowers with prominent stamens.

Chrysanthemum cultivar. Single yellow flowerhead with incurved petals placed in vase in front of window.

Calla lily. Single funnel shaped flower with white spathe and yellow spadix.

Calla lily. Single funnel shaped flower with yellow spathe and spadix.

Glaucous scorpion-vetch, Coronilla valentina subsp. glauca. Small cluster of bright yellow pea-like flowers, background in soft focus.

Popcorn bush, Senna didymobotrya. Spikes of yellow flowers opening from dark, blackish brown buds.