How fast does orange rocket barberry grow?

As far as I know, when it's fully grown, it can grow to be about 4-5 feet tall and about 2-3 feet wide.

I think you'll see around 3–4 feet of growth in 2–3 years.

Sorry, I have no idea.

This shrub plant is absolutely stunning, isn't it? It's amazing how quickly it grows — around 2 feet or more per year!