  Grid (or comb) states are an interesting class of bosonic states introduced
by Gottesman, Kitaev and Preskill to encode a qubit into an oscillator. A
method to generate or `breed' a grid state from Schr\"odinger cat states using
beam splitters and homodyne measurements is known, but this method requires
post-selection. In this paper we show how post-processing of the measurement
data can be used to entirely remove the need for post-selection, making the
scheme much more viable. We bound the asymptotic behavior of the breeding
procedure and demonstrate the efficacy of the method numerically.
