what Bulbo's
 

Can someone tell me what Bulbo's die back . I know theres a few but i would like to know what ones.

I'm only certain of Bulb. monilliforme and the few other species that look like it. The mini leaves stay on until growing season ends, then they yellow and fall off.

I don't know what the others may be.

You can do like me, use some bad neem oil and then a lot of them will die back! I'm never using that stuff again, bad bad bad.