Certainly looks like Dill imo. Doesn't appear to be Fennel from what I can make out of the leaves. Has anyone else smelled it? Perception of scent can be very personal and variable.

myself & 4 others have smelled this. smells nothing like dill. could it be some mild heirloom variety of dill. when it came up dill was my 1st thought too,

Just make sure it's not this one--

Your reference to it smelling like Woodruff is what makes me wonder.

Also, Dill and Fennel can fertilize each other, producing variants.

Here is a link that might be useful: Poison Hemlock Identification

Caraway

It is 100% not Hemlock. Neither it nor Caraway has yellow flowers.

I have frequently seen the statement on the internet that dill and fennel can cross pollinate but have never read it in any reputable book nor seen any scientific proof. They are in different genera. Intergeneric hybrids are incredibly rare.

You might try this question on the Name that Plant Forum. Some of the people there might know if there are any native species in your area which look so dill-like.

Here is a link that might be useful: Name that Plant Forum

Ridolfia?

Now that's a possibility from what I can see on Google. It's not a plant I know personally. Does it occur in the US?

after looking ridolfia up it does sound like a candidate. thing is I have no idea where I would have gotten the seeds unless my supplier sent the wrong seeds. he definitely sent me some tomato varieties that I did not order.

I don't know very much about it, either. I did grow it once to use as a cut flower, but that was quite a few years ago. I don't even remember if it had a distinct scent.

the scent of this plant is very subtle. woodruff is the closest scent I can compare it to but it's not exactly like woodruff. maybe i'll take a sprig to the mo. botanical garden for an i.d..