Would Chemosynthetic plants have any reason to grow tall?

I have a planet too far away from its sun for photosynthesis to work well, so the plants use chemosynthesis. But since they don't use sunlight, would they have any reason to grow above ground? Some tall(tree sized) ones too? They need to be above ground so the herbivores have easy access to them.

And what structures would these plants have to collect whatever chemicals? This world's lifeforms use liquid methane and/or ammonia (I'm undecided on which one would be best) and hydrogen gas.

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Would Chemosynthetic plants have any reason to grow tall?

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