On Modhoster is circulating a texture pack which replaces the existing grass in FS 19. Thanks to this mod, your grass becomes as tall and (almost) as green as that of the neighbor Pure Farming. After applying it, you literally won't recognize your maps, the rendering is stunning, more realistic, and more detailed, including the addition of flowers here and there.
How to install this pack
1. Unzip your pack
2. Select all the content, move it to the "foliage" directory of your game.
DVD VERSION: \ Program Files (x86) \ Farming Simulator 2019 \ data \ foliage
STEAM VERSION: \ SteamLibrary \ steamapps \ common \ Farming Simulator 19 \ data \ foliage
Warning: make a copy of the base texture files before overwriting them with the new ones.