My mystery plant has set seed. Although the seed is still green but they are already fully off. Pretty sure it’s not an anchusa, and it’s definitely not Cynoglossum amabile. Could it be another cynoglossum species maybe? The first photo is my mystery plant, the other is what I think is Cynoglossum amabile. I do think both are annuals though, they come up all over the place and very pretty they are too. Easy to pull out when not wanted.