For types of crop with health checking, the contract is completed when the player checks the health. For other types, the contract is completed when the player takes the last item from the patch. Should the player get a contract for a crop where they have already checked the health, they will need to plant a new seed and wait for it to grow. If the player is assigned a crop that has already been planted but not checked or harvested (including partially-harvested crops of the second type), it will still count as a contract completion.