I tried lasagna layering bulbs in my garden, planted Fall 2014. It was a Disaster!!
I had 5 layers (In the order that they were SUPPOSED to come up): first, crocus (2 varieties with sequential bloom times). . .followed by Tulips (early and late varieties) and hyacinth (a trio with different bloom times). . .and ending with one variety of daffodils. incidentally, they also went from shortest to ending with the tallest (the daffodils). All bulbs were planted at the suggested depth and at a suggested rate (both according to the vendor.
Fast forward to Spring, 2015. What actualy happened: the crocus came up, but so did the daffodils: the daffodils crowded EVERYTHING. . the few crocus that managed to get enough sun to bloom were totally obscured by the fronds of the daffodils. About a third of the tuliops bloomed (all together) and all of the hyacinth (also all at the same time); they couldn't be seen at a distance for the daffodil fronds but if one parted the frond, these blooms were so PRETTY!!
Upshot: I won't do THIS again!! I had my garden helper carefully dig this area up and I grouped the bubs by main genus. The daffodils were planted in groups of 12 amid my lenten roses, all the hyacinth were replanted ALONE in that same garden area, the salvaged crocus corms were planted en masse around one of my lentenroses (separate from the newly replanted daffodils) and the spent tulip bulbs were sent home with my garden helper to re-grow to blooming size, undisturbed in pots on his back patio!
