What's the proper XB and DX to make stem here?

[J]

Hello, I just began to study about this simulator, and I have a question.

I want to make stem under this crown, I know where to put , but i can't make it appear. 

I need help.

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MESH IJK=50,50,25, XB=0,50,-25,25,0,25 /

&INIT PART_ID='pine needles', XYZ=12.5,-12.0,13.3, RADIUS=1.5, HEIGHT=8.2, SHAPE='CONE', N_PARTICLES=2000, MASS_PER_VOLUME=30.  /

&SURF ID='shape', COLOR='CHOCOLATE'/
&MULT ID='cube array', DX=0.1, DY=0.1,DZ=0.1, I_UPPER=82,J_UPPER=82,K_UPPER=82/
&OBST XB=-0.5,0.5,-0.5,0.5,0,0.5
MULT_ID='cube array'
SURF_ID='shape'
SHAPE='CYLINDER'
RADIUS=0.3
HEIGHT=2.0
XYZ=12.5,-12.0,11.3
ORIENTATION=0,0,1/

[Randy McDermott]

You have a grid resolution of 1 m and a "radius" of 0.3 in your cylinder.  I would not worry about mult in this case and just make one OBST that acts as the stem.  Easiest to just add THICKEN=T.  For example,

&OBST -0.5,0.5,-0.5,0.5,0,2, SURF_ID='shape', THICKEN=T/

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