Sometimes I get asked what I use for my seed starting mixture. If you dig deep enough into this blog you'll see that I've done testing with different seed start mixtures. I prefer a soil less mixture. Some of the best genetic pumpkin seeds can be hard to come by so I prefer a medium other than soil so I can be sure that no pathogens are in the mixture. Pro Mix BX is my favorite seed starting mixture, but so far it has been hard to find in Utah. I had one bag, but that wasn't enough for my two pots, so I'm trying coco hair this time in a couple of pots, which I've read good thing about.
In my pots I'll add some humic acid, NPK Industries Microbes Grow formula and this year I also added some Lebanon Turf Roots (I bought it for the landscaping plants I've started indoors). In those two substances there is a good mixture of myco and beneficial bacteria along with micro amounts of different nutrients. I don't put any fertilizer in the pots. Everything the plant will need for three weeks are in the seed starting mixture and fertilizer is not necessary. I won't give the pumpkin plants any fertilizer until they are planted outdoors in the soil. Actually I do give the plants some diluted kelp in the pots, but that is about it.