The numbers of the Fibonacci sequence and the Fibonacci sequence
itself occur frequently in plants. The patterns of leaf growth
on branches are related to the Fibonacci sequence, as are the double
spiral patterns of seeds on sunflowers. The surface areas of artichokes,
pineapples, and pinecones are covered by “scales” arranged in patterns
related to the Fibonacci sequence. Perhaps the simplest example
of the Fibonacci sequence in nature can be found in flower petals: in many
flower species the number of petals on a blossom is a Fibonacci number.
The above are just a few examples of flowers with a Fibonacci
number of petals. Others include enchanter’s nightshade, buttercup,
delphinium, columbine, aster and daisy. Some of these flowers
always have the same number of petals, but some, such as daisies, can
have either 13, 21, 34, 55, or 89 petals.