Plant ID please

[northepaul]

Can anyone identify this plant which I saw growing in a veg patch in the summer? I thought it was very attractive and would love to grow it myself.
Thank you

[Capsid]

Purple mizuna?

[WrexTheDragon]

or Tree Spinach?

[northepaul]

Ooh thanks it looks like it might be tree spinach, thanks Wrex

[Speed Gardener]

Looks just like the Mexican Tree Spinach I grew this year, it must be a close relative of Fat Hen because they both look pretty much alike. My two plants are about 6 feet tall and loaded with seed, I can send you some, just PM me your details if you want some. It shouldn't be long before the seed starts dropping off.