How do I add biomes to a procedural mesh?

Development Programming & Scripting Blueprint
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I have a procedural mesh that creates terrain at runtime.

And am applying a material that uses noise to to show the 2 different biomes like this:

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But I cant find a way to read the colours when I go to place objects local to those biomes.

I realise I am probably doing this backwards and should assign the biomes first then add the colours but I have been totally lost on how to do this for several days.

Any help is greatly appreciated.