# Wrapping multicolumn in tabu

How do I get the text within a multicolumn to wrap when using tabu? I am hoping that tabu makes it somewhat easier than having to specify p with a manual specification of the width \multicolumn{2}{p...}{...} since one of the main reasons I am using tabu is to get the tables set more automatically but my reading of the tabu manual and my trial and error attempts and not been successful.

Here is an obviously wrong attempt since c does not wrap but at least it gets some code out that could be modified:

\documentclass{article}
\usepackage{tabu}
\begin{document}
\noindent\begin{tabu} to\linewidth{|X|X|X|}
\tabucline-
\multicolumn{2}{c}{ 1 aaaaaaaaa 2 aaaaaaaaa 3 aaaaaaaaa 4 aaaaaaaaa 5 aaaaaaaaa 6
aaaaaaaaa 7 aaaaaaaaa 8 aaaaaaaaa 9 aaaaaaaaa}&Feb\\
Mar&Apr&May\\
\tabucline-
\tabuphantomline
\end{tabu}
\end{document}


which gives this output:

-

You can use a p column of the width calculated. In tabularx it would be \TX@col@width but in tabu it seems to be called \tabucolX

\documentclass{article}
\usepackage{tabu}
\begin{document}

\noindent\begin{tabu} to\linewidth{|X|X|X|}
\tabucline-
\multicolumn{2}{|p{\dimexpr 2\tabucolX+2\tabcolsep+\arrayrulewidth\relax}|}{1 aaaaaaaaa 2 aaaaaaaaa 3 aaaaaaaaa 4 aaaaaaaaa 5 aaaaaaaaa 6 aaaaaaaaa 7 aaaaaaaaa 8 aaaaaaaaa 9 aaaaaaaaa}&Feb\\
Mar&Apr&May\\
\tabucline-
\tabuphantomline
\end{tabu}
\end{document}

-