I pulled out this plant thinking it was a weed but am having second thoughts, does anyone know what this is?

Are the leaves fuzzy? It could be an Oriental Poppy. The season is right for it as well. Here's a photo from davesgarden .com

I'm thinking poppy, as well. Are there more?

Ragwort. I have some plants in my garden, I'm keen to always have some as the flowers attract several different species of flies. Syrphidae, Tachinidae, and Conopidae mainly, I've had some rare species on them. They are biennial.

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

The caterpillar of the Cinnabar Moth feed on it, don't take notice of scare stories about poisoning horses if you don't have horses. It's been the subject of controversy and unnecessary destruction.

h-hm. i don't think it's either. it somehow looks very familiar - can it be some sort of edible? it resembles white russian kale somewhat, also mustard mizuna, but it's bigger.
where was it growing? when did you pull it out?

It's Ragwort.

can you post a pic of stems, JR, since you have it in your garden? it seems to me the stems are not that thick and white. and leaves more roundish and central top is fatter, bigger. and overall on pics it looks different somehow.

Ragwort varies.

Nineteen species of the Ragwort genus, Senecio, occur in the wild in Britain

https://www.buglife.org.uk/sit...

(different buglife)

Two pics, one of a young plant in June 2012 which had reddish stems, it was growing on stones with sand underneath. The mature plant at end of January. Yes, they made Ragwort flowers.



More young plants from June and July.

i am still not convinced

I am.