  Using the inverse period map of the Gauss-Manin connection associated with
$QH^{*}(\mathbb{CP}^2)$ and the Dubrovin construction of Landau-Ginzburg
superpotential for Dubrovin Frobenius manifolds, we construct a one-dimensional
Landau-Ginzburg superpotential for the quantum cohomology of $\mathbb{CP}^2$.
In the case of small quantum cohomology, the Landau-Ginzburg superpotential is
expressed in terms of the cubic root of the j-invariant function. For big
quantum cohomology, the one-dimensional Landau-Ginzburg superpotential is given
by Taylor series expansions whose coefficients are expressed in terms of
quasi-modular forms. Furthermore, we express the Landau-Ginzburg superpotential
for both small and big quantum cohomology of $QH^{*}(\mathbb{CP}^2)$ in closed
form as the composition of the Weierstrass $\wp$-function and the universal
coverings of $\mathbb{C} \setminus (\mathbb{Z} \oplus e^{\frac{\pi
i}{3}}\mathbb{Z})$ and $\mathbb{C} \setminus (\mathbb{Z} \oplus z\mathbb{Z})$
respectively.
