My seeds did not germinate well last month. They were very slow and sparse. Some of the ones I was about to give up on are germinating now. Others nothing. July and August are not good planting months, but it is usually not this bad.
I grow silver queen corn too. Mine will get up to 8 ft but I use synthetic fertilizer and the tassels do come out before the ears and silks appear. The tassels do not mature until the silks emerge. The corn ears grow quickly and usually 10 days after the tassels appear my corn is just about ready to harvest. Silver queen takes about 80 days.