An intriguing composition. I'm guessing these were inspired by the mandragora myth? The humanoid plants here look a lot like the Twizzler Goddesses, but the way you've twisted them around and forced them to grow into themselves makes them much more visually interesting. I didn't notice at first, but these seem to be in sculpted cavities in a solid green material, not three jars as I'd assumed. These designs and the green color make me think of plutonium pellets in storage. The ribbed bottlenecks are interesting, and suggest molten metal has to be poured in to seal one of these cavities with a stopper that can never be removed. I'm guessing the implication is that the third thing died when its air was cut off, while the other two are sprouting into the unseen world above.
It's not a series, the title just has numbers in it. The title is also a joke, this one from my wife. The stopper is meant to be rubber and the cement was meant to be yellow but colorblindness struck again. The idea I was going for with the third is that it's been 'harvested', as if these were grown for some purpose. What that purpose might be I don't know. More of a purely surreal thing rather than a sci-fi concept.
Doing an image search now, I see there are horizontally ribbed rubber stoppers. I never knew that before. The one in this piece looked to me like something that could never possibly come out again, which I thought was part of the meaning behind the piece.