If i create a terrain and populate with an eco system is it possible to stop plants /trees etc from growing out of any water i might add later such as a small pond? I know i could paint them on but was looking for a more automated method many thanks in advance

you could have the material as a mixed material and then use a distribution map to place the ecosystems and the water, although im sure there are better options :)

Rich

http://blog.richard-potter.co.uk

On the terrain eco, click the Decay near foriegn objects box on the Density tab.  It should not populate under the water then. 

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Yes that works rather foolish of me not to realise that water counted as a foreign object! thanks