From these last series, they've received a long warm period and will now go into cold storage. Here the two extremes in seed size: P. ludlowii (or a hybrid with P. lutea/delavayi) versus P. tenuifolia (P. biebersteinia). The latter one is quite prone to rootlet rot is my experience,...

Worked like a charm this time. Rooted seeds of nearly all 'difficult' samples and almost all of them looking perfectly healthy.

Yes. But I'll have to admit that I haven't done a decent trial comparing seeds treated with GA3 and a control group. When soaking the seeds 24-48 hours prior to the warm treatment in vermiculite, the water has a concentration of 200 ppm (parts per million) GA3. Given the...

Thank you for your comment. I didn't know cryoprotectants existed, I might have a look at that in the future, but fogging them seems like an extra task and is perhaps not very easy to do. The research station has stopped work on this, project money ran out. I've...

Thank you for your comment. Perhaps you are right, this hadn't come to my mind. The first year I tried the experiment there were no grey spots and the temperature was slightly higher. The problem however was that the buds developed further and they were thus more 'open' at...