Using particle hair to plant objects

I created tree mesh and a landscape.
I created hair(particle one) and in options Visualisation I choosed Object (Tree).
What I have to do, to keep Trees vertical?

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In the Particle Physics panel, set the rotation from None to the Object (the object axis you want is dependant on how you’ve modelled it)

But then I can’t place particles as I want…

Not Exactly–they are placed randomly, but I can earse them…

Should I use Weightpainting?

You set the rotation so it points in the right direction.
Everything you need to know is here http://www.blendercookie.com/2009/02/18/painting-instanced-objects/

K, I figured it out already.
Also (hope it’s last), is there any way to export created particles w/Object as objects?

Go to the frame where you want the objects then from the menu: Objects / Clear/Apply / Make Duplicates Real Shift+Ctrl+A