[UCANSEE2]

Heliotropism isn't the plant growing towards the Sun (which direction is towards the Sun?); it is the plant turning its leaves towards the Sun.

So, if I am driving down the street, and I turn the steering wheel, which turns the front tires in that direction, you are telling me that I won't actually turn left, but my tires will be facing it as I go by?

[allmendream]

What I am saying is that if you see a plant and it is growing in a particular direction; is that direction “towards the Sun”?

Is it towards the Sun at morning, evening or midday?

What direction is “towards the Sun”?

Heliotropism is the turning of the leaves, like little solar panels, so that they are perpendicular to the incoming sunlight. This is caused by hydraulic pressure in the stems.

A sunflower faces east in the morning and west in the evening; which direction is it growing?

[allmendream]

Perhaps the source of our mutual confusion is that I am talking about Heliotropism (moving leaves to be perpendicular to the incoming sunlight, or solar tracking) and you are thinking of Phototropism; a plant growing towards its light source.

From Wiki....

Heliotropism is the diurnal motion of plant parts (flowers or leaves) in response to the direction of the sun.

Heliotropism was first described by Leonardo da Vinci (along with gravitropism) in his botanical studies. The term “heliotropism,” though, was introduced in the early 1800s by A. P. de Candolle, for the growth of the stem tip towards light, which is now called phototropism. The term heliotropism is now used only for solar tracking.