In the current version of UE4 you can’t use static lightning with vegetation placed by the foliage tool.
I need lightmaps because of their superior quality but if you want a forest for example, you need a lot of vegetation and for every plant you place there is at least one draw call (depending on your material even more) added because there is no batching if you place them without the foliage tool.
I have experianced that small foliage like grass, which is placed very often in the map, has very poor performance because they are dynamicly lit.
At the current state there is the battle between draw calls vs dynamic light. Both decrease your performance with larger numbers.
I am curios what is the problem that does not allow foliage to be lightmaped. Are there technical limitations or is this feature not requested by a lot of people.