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As small as mine are even after a year I am repotting them in a different mix to see if this makes a difference. It might be the heat. We get 30-40C here in the summer. Though I thought I looked at the climate of their region in Mexico and I remember thinking it would be suitable at the time. Maybe they are more alpine than I originally thought.
One thing I did notice was that the shoots died in full sun. When I moved the pots back to dappled shade under a large chilli bush they resprouted. This doesn't look like the case in their native scrubland but they seem to like breaks from Aussie sun at least.