plant
Explanation
This comic takes the concept of plant propagation by cuttings and grafting and applies it to human reproduction, with darkly humorous results.
The setup has a character declaring: "Planting trees has convinced me that life would be way better if we grew from cuttings." This refers to the horticultural practice of cloning plants by cutting a piece off one plant and growing a new one from it, or grafting different varieties together.
The nursery worker (wearing an apron, standing behind a counter with what appear to be potted plant-children) then describes one of the available "children" using grafting terminology: "Well, we're growing the child on bully stock so it's large and assertive, but above the belly it's obedient nerd-meat." This mirrors how fruit trees are grown on specific rootstock varieties chosen for hardiness, size, or disease resistance, then grafted with a different variety on top chosen for fruit quality.
The customer enthusiastically responds: "Lovely. I'll take six."
The humor lies in the matter-of-fact application of agricultural language to human children. Describing the lower half as "bully stock" (for physical dominance) and the upper half as "obedient nerd-meat" (for intellectual compliance) is a grotesque but funny parody of how parents often wish they could pick and choose their children's traits. It also satirizes the transactional way some people approach parenting -- treating children like consumer products with customizable features. The casual "I'll take six" amplifies the dehumanization for comic effect. There is also an undercurrent of satire about genetic engineering and designer babies, taken to an absurd, low-tech extreme.