How likely is carrot to be pollenated by poison hemlock?

[oldmobie]

I have one carrot that survived last winter in-ground. It's not blooming yet, but it's from seed Joseph Lofthouse sent me, so I expect it to produce pollen of it's own. There's a common weed around here that I never paid attention to before. It's leaves and blooms are pretty carrot like, so I looked it up. Poison hemlock. It's all over the neighborhood, but I have a stand of it you can't even see through, ~100-150 yards from my carrot. If blooming coincides, is the pollen likely to travel that far? How likely is the carrot to be compatible? Are carrots self-compatible? If I end up with a carrot / hemlock cross, is it 50%-50% odds it'll be poisonous? Or more like it WILL be poisonous, but less so than pure hemlock? If crossing and poisonous offspring are possible, is there a reasonable way to mitigate the danger? I'd sooner dispose of the carrot before it flowers than risk poisoning myself or someone else, but I hope it won't come to that. Carrots aren't very happy in my garden. I'd love to adapt them.

[philagardener]

I wouldn't think crossing with Poison Hemlock would be a problem. You might get crossing with Queen Anne's Lace, if that is in your area (its the same species).

You could bag a bunch of flower heads in row cover fabric to exclude cross-pollinators and then introduce a few flies to do the work!

[billw]

Hemlock is 2n=22 and carrot is 2n=18. Pretty unlikely, I'd say.

Plus, there is the lack of any stories of people dying from eating crossed up carrots.

[richardw]

Hemlock is widespread in my area, never had crossing but it is a host plant for carrot fly (Chamaepsila rosae), curse that Hemlock.

[diane]

You can get rid of the hemlock easily. Our allotment gardens had it and I eliminated it in about five years
by not allowing it to set seed.

The seeds do not remain viable for long, so the soil seedbank was soon exhausted.

I continue to monitor all the plots, though, as fresh seeds might be brought in on grass clippings or in
truckloads of leaves brought in for mulching, and inexperienced gardeners might not recognize it.

[richardw]

Hemlock seed clearly dont travel far on there own because ive had none show up on this property yet the riverbed one km to the south is full of it