Looking for the name of a plant my horse liked (no photo)

[Green Bean]

I am hoping some one will know what the plant I am looking for is called. Unfortunately, I do not have a photo of it as it was growing in a previous yard. Here goes :
Grows about 30-50cm high
Leaves and stems have slightly prickly bits sticking out of them
Has little yellow daisy like flowers that have mini dandelion like seeds when flower is finished.
Hoping someone will know what this plant is Reason for asking is my horse liked to eat these plants

 

[vhf]

Hi, Try googling sow thistle, it sounds a possibility to me?

Common Sow Thistle

Very common, tastes just like lettuce and can be found throughout the year unless there is a really harsh Winter.

www.wildfooduk.com

 

[holeymoley]

Is it a gorse bush?

 

[OrangeAndLemon]

Deleted, not what I thought.

 

[BBP]

My guesses without a photo are groundsel, but it does contain toxins, or prickly lettuce which my horses like.

 

[Quigleyandme]

Milk thistle? My pony loved it.

 

[Green Bean]

Unfortunately no right answers yet. The stems and leaves have prickles on them and are quite stiff, so not a dandelion on the ground type of plant, but rather one that has stems and leaves but not a 'thick bush' type formation. Gahhh, I wish I could find it

 

[Green Bean]

I just found it!! It is called Bristly Oxtongue

 

[Quigleyandme]

I just looked Bristly Oxtongue up and it has historically been used as a wormer. The leaves are described as unpleasantly bitter so perhaps your horse is self-medicating?

 

[Green Bean]

Quigleyandme, that is interesting. I have tried to hunt down some seeds of the plant but the only place that advertised them is out of stock, just my luck. Will have to stalk them! Who would have thought I would be looking for weed seeds

 

[BBP]

I just found it!! It is called Bristly Oxtongue

Ah of course!!! My guys like this too.