I'm not sure my R gigantea is doing anything apart from existing right now. There has been no change at all and our weather has been very variable - a month ago we were still having frosts and then there was a weekend with daytime temps of 25 deg C and then a cool week and then another hot week end and now it is cooler and overcast - it is difficult to find the right place to keep it, and our humidity is very variable - it's a bit dispiriting to be honest.
Congratulations on your spikes - I shall keep on hoping
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