I want to create an ecosystem where the plants are both large and close together. But whenever I change the scale to make plants bigger, the density drops off, so much so that even with the density setting at 100% there are only a few scattered plants. How can I make the density independent of scale?

You can't. The bigger the plant, the smaller count, which is mornam, because if you have a 100m square terrain, and you want to populate with 1m square wide cubes, at 100%, you get 10000 cubes. Now populate with 10 m2 cubes, what do you get:100 cubes. Simple maths. If you want more instances, you'll need to stretch the terrain.

That supposes that cubes can't overlap. If I have a tree as my ecosystem instance, and the tree is 50' high, what is the logic in supposing that trees must also be 50' apart? In practice a tree may be 50' high and only 20' wide. Not a cube at all. What I'm trying to get is dense forest, and what I'm ending up with is savannah.

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Here is an easy way to force VUE to add more plants. On the density tab you have the slider that maxes out at 100%. Rather than use the slider, manually input a number higher than that and it will force the program to add more than 100%. For example, if set to 100% you hit the populate button and it generates 1000 instances of your ecosystem, input 500 and then repopulate you terrain. While it doesn't give 5 times the original amount it does however force more instances of your ecosystem. Just play around with the numbers and go as high as necessary to fully cover your terrain. Hope this helps

Thanks, both good ideas. I keep forgetting that 100% is not the max in Vue.