Vegetables are not perennials Bob they grow and produce a crop in the same year or, occasionally the next year. I do not kow of any perennial vegetable crop.

Here's a partial list, Bob:

Asparagus.
Rhubarb.
Artichoke & Cardoon--probably perennial only in the mildest coastal areas of the UK.
Jerusalem "Artichoke"--needs a hot, sunny exposure, but may become invasive there.
Leaf Chicory, some kinds.
Domestic Dandelion.
Watercress.
Garlic, some forms.
Hardy Bamboo Shoots (Phyllostachys edulis)--probably will be hard to find, and hard to contain!
Sea Kale (Crambe maritima)

There are others, but they are mostly tropical, and couldn't be called a perennial in the UK.

You could try spinach. I grew some from seed and they came back several times. They didn't even mind being transplanted. Sea kale is still popping up in my current garden, even though no-one lived there for many years. Both had withstood some pretty harsh winters.

Don't forget Asparagus.

Hi there,

My swis chard is still going strong from last years plants.

Happy gardening.

There is a very nice broccoli called 'Nine-star perennial' although not always easy to find the seed.

Thank you all very much xxx