In with the old, in with the new

Sweetpea 'Cupani': the original, introduced in the 17th century

Sometimes I think there's never been a more exciting time to grow your own.

It was brought home to me when I went round the inspirational kitchen garden at Knightshayes recently. It's no showcase museum piece but a belt-and-braces, workaday sort of garden which pays its way by selling its produce, so what it grows needs to be worth growing.

Its indefatigable head gardener Lorraine is a keen advocate of heritage varieties – 104 heritage tomato varieties (she likes German beefsteaks and the near-wild species tomato, Solanum pimpinellifolium) and 10 heritage garlic, plus peas, sweetpeas and potatoes.

Pea 'Magnum Bonum': modern pea breeding has focussed on dwarf, self-supporting peas but hugely tall 19th century varieties like this one and the 'Telephone' strain are far heavier yielding and more satisfying to grow all round

There's a bed of oca next to the onions, and she's got achocha scrambling among the toms in the greenhouse. In fact, it's just like my garden (though on a spectacularly larger and less weed-ridden scale): familiar veg like carrots and cabbages rubbing shoulders with the very old and – to the UK, anyway - the very new.

Achocha in the greenhouse: this one is the exploding cucumber type (Cyclanthera explodens) not the edible achocha which is a finer, less coarse (if also less amusing) plant. The fruits of the edible one taste of sweet peppers

Until about 10 or so years ago, we had to put up with a limited range of ever-blander varieties created not for us little insignificant gardeners but for large-scale farmers and supermarket buyers. That meant they were all exactly the same shape and size, they were robust and held together well enough to be picked by machine, and they stored well for long periods of time in refrigerated lorries.

Well, as a set of criteria for choosing something worth growing in your back garden I can't think of a worse lot of reasons.

You may have noticed that there are a few things missing from the list. What about flavour? Juiciness? Explode-in-the-mouth ripeness that makes you dance round the kitchen in glee?

Babington leeks and and old Italian variety of green garlic, in the main garden

Now we've got the rediscovery of heritage veg, nostalgia veg (I'm talking samphire, scorzonera, Hamburg parsley, skirret – whole families of edibles we used to grow but don't any more) and the arrival of a whole world's worth of exotics. Joy Larkcom started it by going to China and bringing back mizuna, mibuna and pak choi; now there's Mark Diacono and his Szechuan peppers and James Wong persuading us to grow everything from wasabi to electric buttons (Spilanthes oleracea) which pop and fizz in your mouth like space dust.

It's telling that at the Edible Gardening Show earlier this year, when Suttons brought a few Danish trolleys' worth of the weirdest edibles they could think of as an experiment, they'd sold out by lunchtime on the first day. This is no passing fad: our curiosity is well and truly piqued.

And then there are all the ornamentals which turn out to be edible: Fuchsia berries (try 'Riccatonii'), flowers from sweet rocket to nasturtiums and violets, Eleagnus berries and elderflowers.

Heritage toms in the lean-to greenhouse. Lorraine says they go through a 'teenage' stage and sulk for a while when they reach about 6" tall: but they get over it, and romp away so fast they catch up with everything else around

Some argue heritage varieties aren't worth growing; well, I'll continue to swoon at the faint-inducingly gorgeous flavour of my 'Marmande' beefsteak tomatoes, if that's OK with you. Tricky as hell to grow, but you keep going just to have one unforgettable taste – and you try buying that in the shops.

And besides, heritage varieties saved by The Heritage Seed Library preserve our genetic pool of veg varieties – whether or not they're worth giving garden room to - so we don't narrow it all down so much we're breeding in ever-diminishing circles.

At the other end of the spectrum you've got the early adopters: those who say traditional veg are boring and everyone should be throwing out their spuds in favour of yacon. Well: given that all my potatoes have gone over to blight in the last week there might be something in that (though I'll mourn the loss of my 'Duke of York' should that sad day ever come).

But on the whole, for most people (certainly for me) the whole process of getting to know exotics is a series of experiments. I've tried and rejected tomatilloes – lovely plant, but not enough crop or uses for it (much as I like salsa) to justify the greenhouse room. But I now grow sweet potatoes every year, in big baskets under cover, as though the crop isn't huge it's big enough and it makes a nice change from the spuds.

And just as we thought there was time to get bored, along come yard-long beans, Chinese arrowroot and lablab beans courtesy of Sally Cunningham's Sowing New Seeds project for Garden Organic. Some will go the way of ra-ra skirts and beehive hairdos: others (my money's on the lab-labs) will be the allotment staples of tomorrow. Isn't it great?

Have you seen this gooseberry?

I love a good urban myth. A good rural myth is even better.

There is a gooseberry known as the Flintshire gooseberry. It is, rumour has it, a prolific cropper: it was born and bred in north-east Wales, around the Wrexham area, and if you ask anyone around there who knows fruit, they'll mention it with pride as their local gooseberry.

The trouble is, it may not even exist.

One man has been looking for this gooseberry, quite hard, since 2003, and still hasn't found it. He's Simon Farr, who runs the North East Wales Orchards Initiative, currently surveying and reviving ancient orchards in north-east Wales and neighbouring counties in England. Now even he admits he's beginning to wonder if it's a myth.

'We've gone through the old catalogues and looked in all sorts of places to find it,' he told me,' and there's not even a description.'

His orchards survey already has one high-profile success story when it comes to finding obscure fruit: the Denbigh Plum, first mentioned in 1785 and believed to be the only surviving native Welsh plum, was almost extinct a few years ago. Then its plight was highlighted by the project, and caught the attention of a chap called Ian Sturrock.

Ian has a good pedigree on saving rare fruit: he's responsible for rescuing the Bardsey Apple, the last tree of which was found growing on an island off the north coast of Wales. Much grafting later and you can even buy one to grow in your garden; and so it is with the Denbigh Plum. In fact so complete is this fruit's return from obscurity that it now has its own festival.

Not so the Flintshire gooseberry, though. Simon says almost everyone in the area can tell you about it: if it is a myth, it's certainly a persistent one. Some even remember having a Flintshire gooseberry in their gardens, or their parents' gardens. What's worse, all they can tell you is that it was a prolific cropper: no word about what it looked like, or even if it was a green or a purple variety.

Simon thinks it might just be a chance seedling from a wild gooseberry, found commonly in the hedgerows here: they're also reported growing further afield, too, in the Lake District and Northumberland.

Wild gooseberries are small, the size of marbles (the Plants for a Future database has them at 1cm diameter), and also rather hairy and can be sharp to the taste (though if you can find the plum red ones, they're much sweeter – if you beat the wasps to it).

There's a fair bit of debate over whether these hedgerow gooseberries are truly wild, or just garden escapees. There's no particular reason why Ribes uva-crispa shouldn't be a wilding: it grows perfectly well in most temperate woodland settings, and there's a long and honourable tradition of wild gooseberries in America, though they're different species: there's Ribes oxyacanthoides, the bristly wild gooseberry; R. cynosbati, the prickly gooseberry; and with no small relief R. hirtellum, which is merely a bit hairy.

And there is a wealth of common names for gooseberries – 26 of them, grossetts, feaberries, goosegogs... – which hints at a long history. They've been eaten since the 13^th century and grown in gardens since the 16^th century, although it was (isn't it always) the Victorians who really shook things up in the gooseberry world by breeding many of the best-loved varieties we grow today.

But those who argue that the hedgerow plants are from the garden point out that they weren't recorded in the wild till 1763 – long after it was grown in cultivation. And there's an argument that they aren't British native plants after all: the Botanical Society of the British Isles (BSBI) certainly takes this view, pointing out that the spread of the wild gooseberry has happened since they became popular in gardens. But you can always argue the toss on native status, especially in this case.

Anyway, back to the Flintshire gooseberry: poor Simon is still on the hunt for it, and regularly follows up leads such as the old market gardens in Rhyll said to have a healthy population of Flintshire gooseberries which turned out to be a fine but nonetheless inescapably English collection of old varieties.

So have you seen this gooseberry? If you think you might have it growing in your garden – the North East Wales Orchard Initiative would like to hear from you.