I was wondering if I could split the pots of mums I just bought. Even though I bought the smallest size, I have some smaller pots I want to plant them in and wondered if splitting the root balls of each mum would kill it. It would be great if I could cut the root ball in half and use a smaller portion of the whole pot in my smaller planters.
Your mums are probably in flower right now. Plants are expending maximum energy during the flowering process. Cutting into the root system during the flowering cycle might not actually kill the mum but it will shock it hard enough to cause it to abort the flowers. I assume you bought them to enjoy the blooms so I’d suggest that you not try and divide the plant right now.