Quote - I just bought Martin's Winter Grasslands Mega Bundle today and gave it a try.  His eco-systems are dense.  Really dense.  My RAM dropped to 80MB left (from 1.5GB initially) while rendering just a 800 x 600 GR-lit preview scene (camera facing the ground) even with Dynamic Population enabled.

His grasses look amazing though.

Winter Landscape Here has very heavy ecosystems and .atm: this explains why it wasn't easy to get my final render.