The Q hypothesis has long dominated the study of the Synoptics. It is often heralded as the key to Synoptic interpretation, yet it is simultaneously challenged at nearly every juncture. Regarding parable study, the Q hypothesis offers much by way of identifying redaction, but the impact of identifiable redaction is often overvalued. Those choosing to utilize a Q-guided interpretation of the parable of the Mustard Seed face strong opposition when identifiable redaction is evaluated against form and the author’s intended audiences. Redaction in the parable of the Mustard Seed is identifiable, but it is not easily traceable, nor is it worthy of interpretive shift. The form of the parable of the Mustard Seed offers more-interpretive value than its hypothetical source, and this conclusion offers an important starting point for discussion regarding the interpretive limitations of Q in the study of the parables.