good possibilies are, the backside rotted out of them,they may have gotten too hot. they may have had poor drainage or gotten too old,..,were the scales worth replanting????,. i purchased a e-bay tango asiatic last year and when i removed it from the packet it disintegrated,.,.i potted all the pieces and this year i have many/many shoots,.,.......shame you lost a lankongense,.,.hope you had others,.,.,.Everybody wants to buy my species bulbs, and some get very'' nasty'' when i say no,.[dont understand- or appreciate, how long it takes from seed]--''theyll get over it''..