  We report studies of $B^0 \to \pi^+ \pi^- \pi^0$, using $78 {\rm fb}^{-1}$ of
data collected at the $\Upsilon(4S)$ resonance with the Belle detector at the
KEKB asymmetric $e^+e^-$ storage ring. We measure the branching fraction for
$B^0 \to \rho^\pm \pi^\mp$ to be ${\mathcal B}(B^0 \to \rho^\pm \pi^\mp) =
(29.1 ^{+5.0}_{-4.9}({\rm stat}) \pm 4.0({\rm syst})) \times 10^{-6}$, and find
an untagged charge asymmetry ${\mathcal A} = -0.38^{+0.19}_{-0.21} ({\rm stat})
^{+0.04}_{-0.05} ({\rm syst})$. We find the first evidence for $B^0 \to \rho^0
\pi^0$ with $3.1\sigma$ statistical significance and with a branching fraction
of ${\mathcal B}(B^0 \to \rho^0\pi^0) = (6.0 ^{+2.9}_{-2.3} ({\rm stat}) \pm
1.2 ({\rm syst})) \times 10^{-6}$.
