Janet wrote:
My rhubarb grows continuously.....
So does mine. What came up in spring is still in full leaf and won't die
back until autumn frost. But I don't eat it past the end of July.

But that's kind of the question, really ... given it died back and has
regrown, does the new stuff count as 'new' growth and the past-July rule
would't apply? Or, more likely, is it better not to take the chance ...

(My uncle accidentally killed his pet rabbit with rhubarb leaves many many
years ago, so I'm told)