This is not always the case. I've had seeds that sink not germinate and seeds that float germinate but a much higher volume of the sunken seeds germinate than the ones that float. I would plant them all and hope for the best.

Thank you, i will try them all.

Sometimes a seed has been eaten by a weevil and will be hollow causing it to float. Al

The floating test works well for acorns.

I just started gardening and everything is coming together nicely! Except for my Pacific Giants Mixed colors Delphinium. I was so excited and I was anticipating their growth that I didn't refrigerate my seeds 2-3 weeks before sowing.:( They should have started germinating today but no such luck. I've been digging through and I only see seeds. I don't have anymore delphinium seeds to plant. Whats the next step? Is there any way to save them? Should I stick them in the fridge now? And if so, for how long? And what about watering it? Please somebody help. I really want to see these delphiniums germinate. I've gotten so attached to them and it's so sad to not see them grow.

I have grown Pacific Giants for years and never Stratified the seed. They prefer 70 degrees or more for fastest germination. If they are supposed to germinate in two weeks do not panic if it takes three weeks. Al