I am heading back to Brisbane in the coming weeks and wanted to get people's thoughts on a dilema I had last year. I grew a pumpkin vine, which was very healthy and flurished, it came up with lots and lots of male and female flowers and I had plenty of pollinators (I have two native bee varieties living at my house amoungst others) and I also hand polinated several times. The plant was in full sun and good soil and got fairly regular waterings.
A few of the pumpkins would start to swell but before they had even 'pumpkinised' (started looking like pumpkins) they simply died (just turned to mush). I eventually got one tiny pumpkin out of the whole vine, but even that died when it was very very small. The vine was fine but I just couldnt get pumpkins. Any ideas?
This sounds like it could be caused by blossom end rot, this is usually due to a calcium deficiency which can be treated (without affecting the pH) by applying gypsum.