Butternut squash only male flowers

I have a couple of butternut squash plants, seem to be growing well but only producing male flowers. Seeds were from last year.
Why would this be?
Have a couple of Urchi Kuri also and they are beginning to produce fruits.

 

Tends to be down to the maturity of the plants and growing conditions, keep watering and feeding and they should come good. Sometimes if they get a lot of fruit developing they will revert to mainly/all male flowers.

 

I've not grown these but have grown other members of the same family, pumpkins etc. and they all seem to take at least a while before they start to produce female flowers, length of time varies but pumpkins can take a while.
I think this is why you need an early start as these often need a longer growing season than we normally get in the UK.

I think you still have time but it's running out fast.

 

Might consider pruning this a bit, might panic it to reproduce. Leave enough to sustain the (hopefully) embryonic fruit.Would continue to water but not feed. If it sets many fruit, restrict to 3 or 4.
Regarding time to mature, we will have to see; guess we are due a swing in the Jetstream to high pressure but one can only hope/pray! Perhaps if it was ignored, climate would revert to 'normal'.

 

It sounds to me as if the fruit developed, but not fully. Hence the small seed cavity, and immature/deformed seeds. Probably because the fruit continued to develop after the normal growing season, and into our strange mild late autumn.
Our squash plants grew extra fruit, after I thought it should have stopped. I have yet so see what they are like inside…

 

If the seed are not fully developed it suggests the fruit were not fully ripe or poor pollination, IMO.

 

Looks great. Butternuts are one of the yummiest squashes, I use them for pompkin pie. Boil them till mushy, then add a bit of allspice, nutmeg, black pepper, salt and brown sugar. Add egg yolks, slap in your favourite pie crust and bake. Gorgeous.