  We characterize all plane bipartite graphs whose resonance graphs are daisy
cubes and therefore generalize related results on resonance graphs of benzenoid
graphs, catacondensed even ring systems, as well as 2-connected outerplane
bipartite graphs. Firstly, we prove that if $G$ is a plane elementary bipartite
graph other than $K_2$, then the resonance graph $R(G)$ is a daisy cube if and
only if the Fries number of $G$ equals the number of finite faces of $G$, which
in turn is equivalent to $G$ being homeomorphically peripheral color
alternating. Next, we extend the above characterization from plane elementary
bipartite graphs to all plane bipartite graphs and show that the resonance
graph of a plane bipartite graph $G$ is a daisy cube if and only if $G$ is
weakly elementary bipartite and every elementary component of $G$ other than
$K_2$ is homeomorphically peripheral color alternating. Along the way, we prove
that a Cartesian product graph is a daisy cube if and only if all of its
nontrivial factors are daisy cubes.
