Ive noticed this too
I wonder if the difference relates to the length and amount of roots on each GO
and how thick the GO are.
this is one of the best things Ive ever though up.
I tried cilantro that I used to get at MarketBasket w roots on the herb
but that didn't work.
for cilantro I cut the stalks ' fresh' and put in a yogurt container w few inches of water in the bottom
and then loosely cover the whole container and herbs
then put that in the refrig. I cover the tops so they dont dry out
works fairly well , but they dont grow.
although cilantro grows much like a weed outside in reasonable soil , water and sun
its pretty picky inside !
