Pseudobulb maturation

[malteseproverb]

Of all the orchids I've owned that require pbulbs to form and develop, I've had no luck in getting them to do so. Instead, they either barely become bulby (see last pic for what I mean) before putting out more shoots or they remain shoots with extremely long leaves. Is there a particular reason for this? It's across all different kinds, including oncidiums, brassia, encyclia and cymbidium.

I grow them in 7a zone indoors only, west and south exposure with huge tall windows, quarter strength fert year round, with varying degrees of success in getting humidity above 40 percent, and temps usually above 70. Any advice would be helpful.

Pictured is an odontoglossum I've had for about a year, which unlike the others has only put out the 2 shoots (instead of putting out 2 shoots that then put out more shoots...). You can see the long long leaves but the bottoms haven't turned bulb-like despite growing like this for many months. This one sits in a southern windowsill and is a definitely not the happiest orchid of my collection so maybe not the best example. Only in the past month has the bulbiness sorta started (last pic) which is about as far as it gets for most of my chids.




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