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Unreal Engine 4 Tutorial.
Step 1: Go to project settings - Engine - Rendering - Enable Runtime Virtual Textures. Restart Unreal and let shades compile.

Step 2: Create Materials & Textures - Runtime Virtual Textures and save.

Create Landscape Material: Inside has a Runtime V. Texture OUTPUT(base color).

Create Grass Material: Connect absolute world position to Runtime Texture SAMPLE. Connect the virtual texture you created to this node.

Place actor: Drag a Runtime Virtual Texture Volume to the world. On the right side settings for this search for Source Actor: Pick the Landscape then Copy bounds.
Also, drag the virtual texture node.

On the Landscape settings on your right, drag the virtual texture material.

Shadeless grass:
On the grass texture itself: Disable the SRGB and on Level of Detail: Mip Gen Settings to: NoMipMaps.
On the grass asset: Disable Cast shadows
On the grass Material: Disable Tangent Normals. Shading model to TWO SIDED FOLIAGE.
Do not check Two sided.
Create a vector 3 (with value of 1 on the B) and connect with TwoSidedSign into a Multiply to the Normal Map. 9:40
When using the Foliage tool, on the mesh properties (in this case, the grass), make sure to not cast any kind of shadows.