| Think of it as the circle of life.
Here is a dirty little secret most people dont know.
Once a SB has reached maturity is usually does not grow new roots, the roots come from new SB growth to support the new SB.
the old SB, now concidered back bulbs help nurish the new growth until the new SB has roots to support itself.
There for your back bulbs really dont need roots cause they are done growing.
I would be concerned with rot, but the natural course of an orchids life, such as Onc. and Catt. is to move forward and anything left behind becomes old anchorage.
I hope this helps
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absit iniuria verbis
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