I got a couple growing now. I used one of those Jiffy seed starting things and it worked great!

I planted some seeds from Pinetree Gardens about 10 days ago. They broke ground and now are about 21/2 inches high. Planted them in mix of Spaghum Moss & Black Kow. Put mixture into peat pots and about 1/2 inch of water in a cardboard shoe box lined with plastic trash bag. Planted some tomatos yesterday same way.

You probably just got bad seed or it was old or stored incorrectly. Just buy new seed and try again, broccoli germinates and grows easily.

What bamboo rabbit said....

That is, all else being equal as far as growing conditions; were they in the ground, or containers? Outside or in? Soil or potting/seed-starting mix?

I start almost everything I can as transplants, because of the numerous small critters &/or diseases & that destroy seeds & emerging seedlings in the ground.

In containers in starter potting soil. I set them out for a few hours of morning sun and then bring them under the patio. It's been working well for my squash, tomato, and bean seedlings. I planted a few new ones yesterday, and if nothing happens, then I guess I'll have to try a different prescription. But hoping it was just a bad batch.

Becca, if you use starting mix and plant the broccoli seeds in containers, the only thing that maybe missing is that you planted them too deep. Next time when you sow the seeds wet the mix first, then sprinkle your seeds and put a fine cover of the soil and mist again. To check if the seeds are still good you can sprout them in a wet paper towel.

Silvia