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David, Cameron McMaster recommends giving them a short growing season immediately they arrive in January, then giving them a 'normal' dormancy in summer to turn their seasonality around. I can see this working with the true bulbs (which don't replace the whole bulb each year) but I'm not so sure about corms - surely a short season won't give them time to replace the whole corm and you might be left with a smaller replacement?? I'd be interested to hear the answer too!
I mentioned the one-off multiple offsetting of one of my 'pink' Massonia jasminiflora a few weeks ago. The offsets were potted up together and here they are. All 6 are flowering but two have taken dominance and I will have to be really careful about botrytis on the hidden flowers later. The next picture is their mum. Brian Halliwell's book on propagation of Alpines & Bulbs suggests twin-scaling would work with Massonia. Sounds a worthwhile experiment.