David Shaw had rather big plants last year, you could try contacting him!
In general, think of it as a Paraquilegia growing in a warm temperate climate. Water from above shouldn't be damaging, C China gets heavy thunderstorms and rains in summer, and it gets hot in day time, occasionally 30C or more. Winters are generally mild, weather statistics for Xiangxi for the last 8 years gives a low of -4C in January. Winters in China have become a lot warmer over the last 20 years, so I would not be surprised to see it hardy down towards -10C, just avoid prolonged freezes.
Lisa at Growild is going to do an experiment with GA3, she didn't have luck in the past, so I'd be very interested in any reports on successes. The seeds look very much like Aquilegia, so we don't think they're ephemeral - but again, we have no data to go on.
