How colours relate to each other is best illustrated in the colour or spectral wheel.

First, there is the harmony of adjacent colours. If blue is a dominant colour, for instance, then blue mixed with green and blue mixed with purple will harmonise.

Second, there is the contrast of opposite colours: yellow with purple, orange with blue, red with green...

Thirdly, there is the harmony of triads. For example, if one takes yellow as the initial colour, then the triad harmony colours are red and blue.

As with every guideline, principle or rule, the spectral wheel should be followed with care. For instance, the three primary colours, if used in their most dominant forms, will overpower any other colour included with them, even if those colours are related in some way on the wheel. For that reason, modern planting practice favours the more subtle pastel shades.

Psychologically, the colour blue is cold, yellow is thoughtful and red is violent. It is advisable to keep these colours together with white and black closest to the house, with the very light pastel colours towards the end of the garden to provide an illusion of extra length.

All the plants who have flowers in in the Plant Photo Galleries - see menu on left - of this website will have their Common Name, Botanical Name and Months of Flowering in one of the 52 colour index pages in the Colour Wheel - Flowers Gallery.

Click on number or Wild White in the Colour Wheel for Flowers below:-

Rhododendron yakushimanum

Primary Colours:-

Red.
Yellow.
Blue.

Secondary Colours:-

Orange.
Green.
Violet.

Tertiary Colours:-

Red Orange.
Yellow Orange.
Yellow Green.
Blue Green.
Blue Violet.
Red Violet.

Each of the 12 Colour Sections has been split into 4 Colour Groups plus Black, Gray234, Gray 5, Pure White 6 - Cultivated Flowers and Wild White - Wildflowers in the Black Colour Section.

The Common Name will be in Red if it is a Wildflower, The Botanical Name will link to its Plant Description Page and each Flower Month will link to the respective Flower Colour Comparison Page in the relevant Gallery.

If the Flower Petal is Multi-Coloured, then it will be placed in the Multi-Coloured Row of a Colour Wheel Colour Page that appears to have the majority space of that colour on the petal.

See the other Colour Wheels on Rock Garden Plants, 12 Bloom Colours per month, Mature Foliage and Overall Plant Shape, Foliage over 4 seasons in the menu on the left.

As the number of plants in a Plant Gallery increases, then that gallery will have subsidiary galleries added to it (each subsidiary gallery name is preceeded by ... in the Main Menu of each page, when that Gallery collection is accessed). The access to that collection of galleries will be to the site map of the gallery that contains the index of all the plants in that collection together with comparison pages of 5 Flower Colours per Month. So, if you want a Yellow Flower on a Herbaceous Perennial in June then you inspect that page.