How do you texture grass?
Go to Filter > Texture > Texturize. Adjust the settings to get the look that you want. Another way that you can create a grass texture is by using the brush tool. Choose a grass brush, or any other brush that you think would work well.
Can you add texture in Illustrator?
Sure, that's one thing you can do, but in Adobe Illustrator, you can add vector textures from the Swatches panel too. In this tutorial, I'll show you three different ways to add a texture to your object in Adobe Illustrator. Note: the screenshots from this tutorial are taken from Adobe Illustrator CC 2022 Mac version.