Strange Looking Shadows

Hi everyone, I ran a test render on my scene to see what it will look like when after its rendered in Production Lighting and received some strange shadows on the trees. I am using the foliage brush to paint them on to the scene (lightmap resolution for the trees is 512 at the moment, do i just need to increase it? afraid of going higher because of how long it’ll take to render) Anyone know what i can do to fix this problem? Would a lightmass importance volume work? Any help would be great.

Thank you

512 lighmaps are way too big unless you just want a nice render. and it looks like your UVs are wrong/ not evenly spaced. Can I have a look at the UVs please ? also if you have many trees you probably want them to be dynamic or you won’t have moving shadows in the breeze, let me know !