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This article will help you.
https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm

It looks like either phosphorus or iron deficiencies. It may need fertilizer. The limited research on the climate in your country would suggest that you could move it at just about any time.

This article will help you with the care of the plant: https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm

It won't hurt the plant in any way. In all honesty, she gave herself the short stick in this deal. She left most of the edible portion on the plant still, taking only the poisonous part!

The stalks left will shrivel on their own, but you can cut them off if you need. to. I wouldn't do anymore pulling from the plants this year, though. Especially being in Canada, since for us here in the US... We have to stop picking in July or so in order for the plant to store enough energy to survive the winter.

This article will help: https://www.gardeningknowhow.com/edible/vegetables/rhubarb/harvesting-rhubarb.htm

Here is an article that will help you to grow the plant to its potential: https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm

We do not sell plants, or recommend specific vendors.

I would recommend looking locally, or online vendors through Amazon, Etsy, or Ebay. There may be vendors there that offer what you are looking for.

We do not recommend sources for purchase. We only provide gardening information pertaining growing and maintaining plants.

I would recommend local sources, or searching google for sources that have what you are looking for in stock.

It is difficult to say without much detail. This article will help you to know what care they require:

https://www.gardeningknowhow.com/edible/vegetables/rhubarb/grow-rhubarb.htm