Droopy ZZ plant stems, why?
I have a ZZ plant that is ~2 ft tall, but the largest stems keep bending over all the time. It looks healthy enough; the leaves are a nice deep green and it has sent up 4-5 new stems for the 2 years I've had it. The stems are firm, not soft like if there were rot starting, and it receives enough water. I don't think it's overwatered, and it is in a terra cotta pot to prevent waterlogged soil.
I have it pushed up against the wall of our patio to help support the stems because I'm scared they will break off if they continue to lean. I've tried using rocks to prop up the stems as well, with limited success. Other ZZ plants I've seen have strong, erect stems, and I want mine to look like this too.
Any tips? Thanks a lot.