Do you use a heat mat on the zucchini?
I haven’t been able to get mine to germinate. I grow crook neck yellow squash every year but for some reason I’m not having any luck with the zucchini.
I started them in those trays pictured with domes.The corn and zucchini were in my living room for 1.5 days around 22-24c.
And the other tray of tomato’s and things were in the room with my grow tents around 24-28C for 1.5 days.The heat definitely helps.
Around 1.5-2 days most everything sprouted so I moved it into my heated garage under some t5HO and leds,garage is 18-19C.
If it’s a nice day I put in in my greenhouse but today it’s snowing again so they can chill in the garage
-edit- where do you live? I have a short season in Alberta.
I don’t need to start zucchini early in my climate. I got drunk the night I started my garden seeds this year and I forgot zucchini didn’t need a early start and planted anyways.
If you plant seed on may long weekend you’ll get a harvest