Assuming you meant, learned it in school, in your younger years, let me ask you this:
Were they correct? You were also told that the Universe was infinite (I assume), then you were told it was Finite (after discovery of the big bang wave). Which is true?
We are arguing that scientists of the past may have been misinformed ( like, say, Darwin) and yet you stick to a teaching that may be just as untrue.
Matter of fact, if you look at nature around you, you will see that the Sun is the main force of growth, and that gravity more likely plays only a tiny little part in a plant 'figuring' out which way to grow.
What I'm saying is that if one wants to imply that plants 'understand' and 'use' gravity, (pretty intelligent thing, I'd say), then OK. But, they also know if they don't follow, or grow towards the Sun, they will die.
When the seed planted underground sprouts, it responds to gravity before it can respond to light, because it hasn’t been exposed to light yet.
What I’ve seen is that plants bend towards the light but you can make some interesting shaped plants if you lay them on their side, or like with this new way of growing tomato plants, hang them upside down.
What I’ve noticed is that plants respond more strongly to gravity, wanting to grow up, than they do towards sunlight.