Trimezia culture

 

Hey everybody,

I have 3 Trimezia steyermarkii siblings raised from SIGNA seed that are several years old now.  Only 1 of them has bloomed and it's currently starting its 3rd or 4th bloom cycle (1st bloom was late autumn 2016).  I'm growing them all in pots, indoors, under identical lighting/watering/temperature/soil conditions, so I can't understand why the other 2 plants haven't bloomed at all.

It gets stranger.... one of the unbloomed plants is only one-third the size of its siblings & increases vegetatively much more rapidly than the others.

Assuming the unbloomed siblings are legitimately Trimezia, what could I do to encourage them to bloom?  bigger pots?  stronger sunlight?  new potting mix?  change the humidity?  day/night temperature swings?   dig & divide?  move them outdoors for summer?

Currently they're on a south facing windowsill indoors with no supplemental lighting.  They're each in round 5" dia. pots about 6" tall.

Dennis in Cincinnati

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