Using the answer I got to this question, I have a mindmap with 6 children, each with 2-5 children of their own.
MWE:
% Author: Till Tantau
% Source: The PGF/TikZ manual
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{mindmap,trees}
\begin{document}
\resizebox{!}{4 in}{%
\begin{tikzpicture}
\path[
mindmap,
concept color=black,
text=white,
grow cyclic,
segment length=20cm
]
node[concept] {Main}
[clockwise from=0]
child[concept color=green!50!black] {%
node[concept] {A}
[clockwise from=65]
child {node[concept] {A1} }
child {node[concept] {A2} }
child {node[concept] {A3} }
}
child[concept color=blue] {%
node[concept] {B}
[clockwise from=-20]
child {node[concept] {B2} }
child {node[concept] {B3} }
}
child[concept color=red] {%
node[concept] {C}
[clockwise from=5]
child {node[concept] {C1} }
child {node[concept] {C2} }
child {node[concept] {C3} }
child {node[concept] {C4} }
child {node[concept] {C5} }
}
child[concept color=orange] {%
node[concept] {D}
[clockwise from=-145]
child {node[concept] {D1} }
child {node[concept] {D2} }
}
child[concept color=magenta] {%
node[concept] {E}
[clockwise from=-180]
child {node[concept] {E1} }
child {node[concept] {E2} }
child {node[concept] {E3} }
}
child[concept color=brown] {%
node[concept] {F}
[clockwise from=-245]
child {node[concept] {F1} }
child {node[concept] {F2} }
child {node[concept] {F3} }
child {node[concept] {F4} }
};
\end{tikzpicture}
}
\end{document}
Output:

Problem:
I need the level 1 children (A-F) to be farther away from the parent (MAIN) as even now, F is too close to A and F3 is overlapping with A1. Furthermore, if I want each level 1 child to have 5 or 6 children of their own, then there will be serious overlap. How do I go about increasing the sibling distance on a per child/node, or at least a per level basis.

level 1/.append style={level distance=8cm}was what I was looking for, thank you – puk Jun 17 '13 at 21:01level 1/.append style={sibling angle=60}withgrow cyclic– puk Jun 17 '13 at 21:01sibling anglewas designed to be used withgrow cyclic(see page 476 of the PGF manual). – Gonzalo Medina Jun 17 '13 at 21:06