I grow Jap pumpkins they just pop up when ready & need pruning to stop them overrunning the whole garden. Last year, a very wet year I dispaired of them setting fruit, lots of male flowers in Feb March & April but very few females which would not set even when hand polinated, same with the zuccinies & tromboncinno. Finally in May a few set but not my usual bumper crop.
This year its only March & both my Pumpkin & Trombonccino are producing lots of female flowers & setting without hand polinating - strange is it because this year is so dry, its not as if the weather has cooled down. Or perhaps its because I have recently replemished all the garden with compost & flood debrie?