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We calculate the branching ratios and CP asymmetries for $B^0 \to\pi^+\rho^-$, $B^0 \to \rho^+\pi^-$, $B^+ \to \rho^+\pi^0$, $B^+ \to\pi^+\rho^0$, $B^0 \to \pi^0\rho^0$, $B^+ \to \pi^+\omega$ and $B^0 \to\pi^0\omega$ decays, in a perturbative QCD approach. In this approach, wecalculate non-factorizable and annihilation type contributions, in addition tothe usual factorizable contributions. Our result is in agreement with themeasured branching ratio of $B^0/\bar B^0 \to \pi^\pm\rho^\mp$, $B^\pm \to\pi^\pm\rho^0$, $\pi^\pm \omega$ by CLEO and BABAR collaboration. We alsopredict large CP asymmetries in these decays. These channels are useful todetermine the CKM angle $\phi_2$.Comment: 29 pages, Latex, higher twist wave functions are include

$B\to \pi \rho, \pi \omega$ decays in perturbative QCD approach