[2021] Noob asset question

It depends on what is required for the asset in question. Props and trees are just decorative items, so the asset will load just fine without - it will just not have those props and trees.

If an asset lists a mod or a network as a requirement it is usually a different situation. In this case the asset just won't load without the required item. So you can always test without and add the required item later, if the asset isn't working/showing up in game.