The formation of tissue patterns is often attributed to biochemical reaction–diffusion mechanisms. During Hydra regeneration, however, experimental evidence suggests a crucial role for mechanical cues through a positive feedback loop between tissue stretching and Wnt signaling. We develop and analyze a mechanochemical model of pattern formation in regenerating Hydra spheroids. The model couples morphogen dynamics and tissue mechanics and realizes the local activation–long-range inhibition principle. For a particular elasticity–morphogen coupling in the lower-dimensional special case, the system admits a variational structure. We prove the existence of patterned steady states for small diffusion and the uniqueness of the homogeneous state for large diffusion. Linear stability analysis shows that only unimodal patterns are stable, while bifurcation analysis reveals subcritical and supercritical pitchforks as well as bistable regimes generated by fold bifurcations. Our results demonstrate that mechanochemical feedback provides a robust mechanism for symmetry breaking and single-peaked organizer formation without requiring a second diffusing morphogen.