There are no easy ways to increase the growth ticks in Regrowth, until mid/end game. So as a result upgrading crops takes time. This setup is for afk-ing, allowing the player to leave for a decent period of time and come back later to get the results.

Specifically in this pack weeds are disabled so you will not have to worry about them overrunning.

Using a setup that only allows crops to spread to one adjacent tile, it is easy to find the crop with the highest stat.


Setup:

    S: Soil O: Other W: Water

    SOSSSOS
    SOSOSOS
    SOSOSOS
    SOSOSOS
    SOSWSOS
    SOSOSOS
    SOSOSOS
    SOSOSOS
    SSSOSSS

This is infinitely expandable, just increase the length or the number of the lines. Later in the pack you can have multiple farms going at once to max out your seeds much quicker.

Source: Direwolf20's Regrowth Series