Of the 3 seed experiments...
Basil √ (sprouting nicely)
Coriander √ (ditto)
Parsley
Aha! (Edit)
Start seeds indoors, about 4 to 6 weeks before your last spring frost date. Plant seeds to a depth of 6 mm (1/4 inch). Seedlings usually emerge in 15 to 21 days.
That might explain the delay