Wow, you're very far from us (in PA) yet I had a similar problem. The zucchini here grew very slowly and never really produced. I trimmed it back in late August to almost the base, and the new growth sprouted several nice zucchini, but they're only 3-4" in length. It's supposed to freeze tonight so I guess that I have to harvest them this afternoon.

Beside this plant, I grew "pattypan" squash and they were absolutely prolific.

Go figure!

HMmm... if the 'pattypan' did well then the other squash should have done well too, huh? We had a hotter summer than usual & no rain to speak of at all but we have all our garden on drip lines on timers so that shouldn't have been a facter. I just was perplexed when two packs of seeds didn't even germinate; at least you got some growth! Since the stores had such 'puny' squash & so $$ it must have to be another reason except local conditions. Better luck next year!