Morten St George Theory

[Morten St. George]

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The flower on You are not allowed to view links. Register or Login to view. has a large, round, flat head which looks like it would turn to face the sun for nourishment.
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I'm not sure where you got this idea, but the sunflower head does not face the sun, it faces east.

I found the following on a science website:

Sunflowers are fascinating little specimens of nature, and they allow us to see first-hand how plants are not the static beings we think them to be. These special flowers actually face the sun as it rises in the east and follow it across the sky until it sets in the west.

This phenomenon is known as "heliotropism," which apparently ceases when the plants mature, whereupon they "generally face east," as you say.