If I want a rhubarb plant to produce more, would I just have to harvest it more often? Or would a better fix to this be to plant more plants for next season, either this fall or in the spring?
Over time most Rhubarb plants will increase in size and produce more stalks.
I would suggest planted more Rhubarb to increase your supply.
There are many varieties available and having a few different plants can open up many culinary possibilities!