Here's some plants to make your world look a little better!
Sea Oats & Beach Grass
Sea Oats and beach grass grow on sandy beaches.
Cattails grow in most biomes along river banks and lakes. Cattails can be planted on grass, dirt, sand, gravel, or clay and require its soil block to be adjacent to water like sugarcane, or its lower half be submerged in water.
Bark mushrooms grow on the side of trees in most biomes. Does not drop itself when destroyed, but can obtained via right-click.
A type of mushroom that grows in the Nether. They can be crafted into glowstone dust or shroomlights.
Short grass brings variety to the mundane tall grass.
Found in the crimson and warped forests in the Nether.
Grows on the lava banks of the Nether. Can be grown on netherrack next to lava. Grows slowly, but can be harvested for blaze powder.