Emissive material does not affect Landscape?

Hey Unreal community!

My team and I have run into an issue with emissive lighting when trying to use it together with a landscape.

The idea we had it is that we would like to use alien plants with a glowing “flower” throughout the level to make it look more interesting. However, after checking “Use Emissive for Static Lighting” in the StaticMeshActor’s properties and rebuilding lighting, another mesh like a cube gets lit by emissive light but the landscape around it does not.
I’ve attached a screenshot below so you can see what I mean.

What am I missing? I’ve tried to look for similar answers but I didn’t really bump into anything that would help solve the problem. Thanks a lot for your input!

~Khazzy