Chlorophyll makes plants look green, carotene makes them look red or orange, and xanthophyll makes them look yellow. Plants make fruits and flowers look blue by shifting acidity levels, adding ...

Roses are red, violets are blue. Except they’re not. They’re, er, violet. True blue flowers are exceedingly rare, and not for lack of effort. Plant breeders have repeatedly tried to nudge ...

Bees cannot see red, but they can see blue and green, as well as ultraviolet light. This means colours look very different to what we see, and they can see things we cannot see.

The red, blue and yellow scheme is one of the easiest for gardeners to put together. I used Superbena Violet Ice verbena, Supertunia Mini Vista Scarlet petunia and Superbells Yellow calibrachoa.

a, b, Flower with areas of red or yellow coloration under white light (a); only the yellow areas emit green fluorescence when excited by blue light (b) (scale bar, 1.5 cm).c, d, Light micrographs ...