[dmg]

I have sowed my self saved seeds from my pumpkin rouge vif etamps on 3 different occasions with none germinating.
They were all inside with temps around 20-22c
Could the reason be because of mixed parentage as they were grown beside yellow scalloped squash and near yellow courgettes.

Dmg

[Totty]

I would have thought if the seed cross pollinated it would still be viable, so long as it was harvested when the seeds were really ripe and were stored properly. The plants probably wouldn't have the same characteristics as the mother plant though.

You could try chitting the seeds in a very warm airing cupboard, if nothing shoots within a week maximum, there not going to.

Totty

[madcat]

This could be teaching my grandmother to suck eggs ....  but you do plant them on the edge, not flat, dont you? I find pumpkin seeds have an amazing ability to lie themselves down as I water them into the compost and I have to stand them on their edge again, squishing the now damp compost around them.

[sunshineband]

Uneven pollination  can mean not all the seeds are viable. Try dropping some into a glass of water: ones that sink are those that should germinate, while those that float will not.

And testing the seeds out on wet kitchen roll as Totty suggests is a good idea too.