It could also be that you lost the "mother bulbs" but have bulblets left. The "mother bulbs" (main bulbs) last just a few years here but are constantly being replaced with their babies (bulblets). The bulblets, in turn, will reach decent size within a couple years, bloom large for a few and then steadily decline and die starting the cycle all over. Because of this, I have to divide my glads every 3 or 4 years or the patches become much too thick. Granted, I am in a much warmer climate so I am pretty sure the cycle where you are is slower.
@dyzzypyxxy , do you know off hand how long it takes for glads to form bulblets in the PNW?
