Maybe it read my source, which says 4'. Actually I think 4' was more commonly used before those bedding plant coccineas became popular. Yours just has a wild streak. If it finds that fence to lean on, it could shoot for the stars.

Ha. It's always interesting to see the different dimensional descriptions from different sources.

And to be fair, the other clumps around d the garden are much shorter. It just is really happy right there.

My salvias in Fallbrook always grew nmuch larger than expected.........