Just as an aside... Rhubarb is a very invasive plant. When I lived in Illinois, my neighbor planted some along a fence bordering a garden patch we shared. First year, it grew nicely and more the next year and the next year... Every year we dug it up like crazy and it kept on taking over.
And speaking of invasive, I have a wisteria bush in the front yard. -Don't ever make that mistake folks. It throws out strong roots just beneath the soil surface for 20 - 30 feet in all directions. Impossible to pull it up and keep it from devastating and choking-out any other bushes or garden patch greenery. I do believe it's illegal to knowingly transport/transplant it in some southern states as it goes totally unchecked w/o a winter frost to slow it down.
Ray