San Diego
Full sun

Wild carrot (Daucus carota) is a good bet ..

https://www.google.co.uk/searc...

It could be Anthriscus caucalis ..

http://weedid.wisc.edu/ca/weed...

http://science.halleyhosting.c...

http://calphotos.berkeley.edu/...

I would be wary of eating it just in case it's something else.

Its either Queen Anne's Lace (wild carrot) or Poison Hemlock. They look a like but one will kill you and one you can put in your salad.

http://www.gardeningknowhow.co...

The easiest was to tell them apart is that Queen Anne's Lace smells like a carrot. Poison Hemlock does not.

Daisy

Thank you both. I think it is Queen Anne's Lace based on this quote from the link Daisy provided.
"the stem of the wild carrot is hairy while the stem of poison hemlock is smooth"
You can see the hairs on the stem in one of the photos.

I will smell it the next time I am in the garden to be sure.

-Thomas