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What do you mean? Plants compete for resources (water, sunlight, soil nutrients) as well.

Also, there are diseases that can target specific plants, when unchecked, can wipe out an entire plant population (see Panama disease for bananas for an example)

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> see Panama disease for bananas for an example

Extinction level blights similar to these are not often found in the natural world. They're only a thing because we (humans) eliminated genetic diversity from crops through grafts and clones. If the plants reproduced naturally its likely that a range of genetically diverse children would have been resistant to the fungus.

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