brian mitchell wrote:
The last of these still in the ground are now putting on some luxuriant
topgrowth, presumably gearing themselves up to flower. Would it be
advisable to either cut off the foliage or lift them for storage
elsewhere?

They will probably be a bit woody by now, but can still be raosted.
I always leave a couple to flower. Very statuesue plant, the hover flies
love them, and you get free parsnip seed for the following year. They tend
to breed fairly true. I've not bought parsnip seed in 12 years or so.