Have you labelled them with names and dates?

How long and which are not germinating.

Is it heated,Fisherman? Maybe it is too cold yet,especially night time..

Hi there fisherman. Can you give some more info about what you have sown and what the conditions you have sown in, eg.

Are they in a heated propagator, ?
Is it warm enough in your greenhouse?
Have you sown them this early before?
Are the seeds new or last years?
Are they flowers or veggie.?
What's your compost like?

All these will give a clue as to what is going on with your seed.
Happy growing.

so how long have the seeds been planted for fisherman you havent said,
they wont come up within 72 hours you have to wait at least 14 to 21 days according to what you have planted.
If you have NOT got a heater in the greenhouse you may have a problem because it will take longer to germinate.

Ive planted seeds from last year and this year and all have come up within 21 days and thats flowers and veggies