I’m sure this was entirely satirical, but just in case: you reap what you sow. As in, “this is what you planted and how you let it grow, now you gotta clean it from your fields.”

Sowing is the act of scattering/planting your seeds in the field. Reaping is where you take your sickle (the gardening tool carried by the grim reaper), and actively cut/clear/harvest your fields. When you go to harvest, you want to harvest a lot, but not so much that you’re wasting food; you want your produce easily accessible, but not too sparse; and you want to be sure that you’re actually going to grow the crops that you want to harvest.

If you’re growing corn, you want to be able to walk through your field and to be able to harvest systematically, so you’ll likely want to plant the corn just densely enough to grow in rows so that you can walk/work your way through them. If you haphazardly plant your corn, you’ll find some stalks didn’t grow properly due to overcrowding, you can get lost in thick forests of corn, and your harvest will be tedious and dangerous as you trip over slashed stalks.

Also, if you’re interested in a bunch of pumpkin soup, so you grab random seeds and throw them around, and then blindly water them, you don’t get to be surprised when you find a bunch of rotting tomatoes that you should have harvested sooner.

Or, if you’re lazy and decide to throw your seed everywhere, you’ll usually find that very little grew, or if you sow a small crop because you got tired, you’re going to reap a small crop.

Finally, if you’re like MTJ and were warned multiple times not to sow your wheat next to the poison ivy, but you decide that poison ivy doesn’t deserve its bad rap; you don’t get to act surprised when your legs itch and lose skin after you’ve reaped your wheat, and you don’t get to act indignant when no one wants to buy grain from the person who grows things among the poison ivy.