Before Thanos acquires all the Infinity Stones in Avengers: Infinity War, he had already been going around to many planets, killing off half the population:

  • Drax's planet
  • Gamora's planet
  • The planets of several prisoners seen in GotG
  • The (20+ years) of additional populations of the planets

He's already killed hundreds of thousands in that time... did those planets' populations get halved again after the snap? So Gamora's planet is 25% of what it was before Thanos ever shows up?

We don't know

His plan is to snap his fingers, kill half of all life in the universe and then sit back and bask in the glow of the gratitude of the remaining population.

This is ALL LIFE including plants, animals etc. as was recently confirmed by the creators.

In an interview with Birth Movies Death, Marvel Studios CEO Kevin Feige confirmed that it wasn't just people that died with that finger snapping. When asked about plants and animals, Feige confirmed that half of the plants and animals of the world are now gone, too. He said, "Yes! Yes. All life."

Source

There is no indication of specificity in the movie or targeting planet by planet in the snap. What we see is it's effects on the heroes we know, probably for scale reasons.

Given the sheer amount of life (not just people) in the universe going planet by planet in the snap would probably not be ideal but then we don't know how the Infinity Stones actually work.

Certainly, before he obtained the Stones he was proceeding on a planet by planet basis because that's the only method available to him which is, I feel, the source of the confusion.

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    I find it kinda odd that plants and animals should have been decimated as well, as these pose as a part of the resources available to the people on the planets. Also we don't see any plant (except Groot) vanishing (and I doubt that Groot is a plant as we know it) – XtremeBaumer Oct 11 at 14:33
  • Unforeseen side effect - an example of be careful what you wish for? Mind you - the large amount of of domesticated animals and plants to support human life are as much a distortion to ecosystems as humans are... – HorusKol Oct 11 at 21:13

The SNAP was actually Thanos' way of using the infinity stones all at one time to kill off half of the existing beings of the universe.

Firstly, he wiped out all populations of planets he visited on his way to finding infinity stones, like all nearby planets near Xander must have been cleared before clearing Xandar(Thor-GoTG conversation), and so on.

Secondly, Thanos had this goal in his mind a long time ago (when Titan was normal and happy place)(Thanos-Strange conversation). So he set out oh his quest clearing planet by planet, and whenever he got to know the locations of all infinity stones, he set out to grab them all and settle it once and for all.

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