their baby roots tend to stick to plastic, so,it is best to have a surface you can easily un-stick them from, smoother sided bottles are best, or the wave of the plastic should be up and down so the plant can slide out with dirt as well. I like the ones someone posted with the inner cup is split in half and inside another, so when repoting, just open the split cup. I have to try that. your plant looks very cute. wishing it stays that way for you.