You asked
Do I need a tripod for landscape photography?
Here is what the site says about that.
From Landscape: Landscape: Landscape photography is slow. The light does the work, the scene doesn't move much, and you can use a tripod. That changes what matters in a camera.
From Travel: What to pack: One zoom, plus one small fast prime for evenings and food, is the classic travel kit. Add a spare battery, a second memory card, and a lens cloth. Leave the tripod at home unless you're going specifically for night or landscape photography; see landscape.
Quoted from this site's pages.