Hi, I got these at a box store and planted them in seperate pots. One is going strong and even has 2 shoots to it but the other one in the space of 2 days turned yellow and the stem toppled, I pulled up the tuber to see if there was any rot but there was not, So my question is.. is this normal for these? Is it going into dormancy? there is 2 small bulblets and it looks like it was trying to put out a second stalk altho since I pulled it up it may not do anything. This is my first year with these and they are my favorite spring grower because you can almost watch them grow it is so fast. Thank you for the input.