Directed by: Conrad Vernon, Rob Letterman
Starring: Kiefer Sutherland, Reese Witherspoon, Seth Rogen, Hugh Laurie, Will Arnett
Other mistake: There is a shot of a random newspaper blowing around in the middle of San Francisco. But the paper is from New York, with headlines about New York.
Other mistake: When Derek does his final news report the map in the background says both 32 and 99° in Nevada.
Revealing mistake: Susan appears to pass right through the glass window after knocking down Gallaxhar.
The Missing Link: She's speechless.
B.O.B.: She"? It's a boy; look at his boobies!
The Missing Link: We need to have a talk.
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Chosen answer: Well, it's a fiction movie; some suspension of disbelief is always needed. There could be a number of explanations: for instance, lifeforms such as insects on the grass, bacteria inside them or even grass itself, being unable to absorb quantonium. It might affect only sentient beings. Or Susan might even be the first being to get in contact with the substance - this would be possible depending on the shape of the meteorite container, the exact means by which quantonium touches her body - which isn't shown... but, first and foremost, this happens because its not happening would leave the filmmakers with a plot issue to be dealt with - so, other beings don't grow simply because they don't.