On the colour wheel red and green are on opposite
sides. This means that these two colours combined create the greatest contrast
possible for these colours (the other two maximum contrast pairs are: violet with
yellow and blue with orange). The red-green contrast is especially exploited by
plants aimed at birds and [primates. Thus humans also tend to focus on red
flowers against the background of green leaves. In window boxes this is used to
great effect.
Bronze-green leaves and deep red Ivy- leaved Pelargonium
(left) make for an almost tonal contrast. Red Pelargonium (here a single zonal
type) can also be combined with Ivy (middle). The yellow variegation of the Ivy
tones down the combination. A less variegated ivy makes for a less yellow leaf
that is combined with deep red Kalanchoe.(right) creating a less than maximum
contrast.
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