Thanks all for your comments. I’m as surprised as anyone that this thread is of such interest.
Clayton, you raise a good point about NZ PN vineyard siting, which others will be able to comment more expertly about than me. But I’ll give some background for some who don’t know the areas as well as you.
Martinborough does not grow PN by chance. In the 1970s our science Ministry (DSIR) published some research that the poor farming area would be ideal for grape growing. There were no vineyards there at the time. The main reason is that Martinborough is very low rainfall because the nearby Tararua mountains create a rain shadow (all of the rain is dumped on the mountains and usually doesn’t make it to Martinborough). In wine terms it is cool climate, so is much more suited to ripening Burgundy than Bordeaux varieties. The persistent wind is more of an annoyance than a factor in ripening the PN as I understand it.
The other factor is geology. The earliest vineyards around the township were planted on the old river terraces of the Ruamahanga river. The soil is silt loam with up to 15m deep alluvial deposits, with the stones helping to reduce diurnal temperature variations (and reduce sweet and sour flavour combinations you can see in some immature NZ PN). That area is tiny (about 1 km x 5 km) and now full. It is no surprise that the big new Martinborough vineyards, including Escarpment and Craggy Range, are sited on old river terraces in Te Muna Rd.
Many years ago Brodie T did some work in this area and would be able to comment more expertly than me.
The original vineyards (including Ata Rangi and Martinborough Vineyards) made a big call to plant their pioneering vineyards with PN in the late '70s, early '80s and are now reaping their reward in vine age.
I don’t know if the alluvial plains nature of Martinborough will limit its development.
Most NZ vineyards have a maritime climate. The only exceptions are the Central Otago ones that are the highest elevated and so far inland the climate is continental. It is a similar longitude south to Burgundy in the northern hemisphere (45 deg south cf 47 deg north) and the southernmost vineyard area in the world. Therefore it has hot, dry, reliable summers and snow in winter (but so does Burgundy, and is not an issue). Fruit quality is typically very high and triaging and declassification is minimal. The Bannockburn vineyards are also largely on north facing slopes.
In the weekend it poured with rain when I was at the Queenstown airport. Later in the day, 50 kms away, at Felton Road I asked about the rain. It had barely registered on their rain equipment. Blair said that his vineyard gets a third to a quarter of the rainfall at the airport. The Southern Alps produce a rain shadow effect (as low as 400 mm per annum I understand.
My point is that these are small, special areas, that should produce truly special wines in the future as their vines age.
You are perceptive IMO to cite Marlborough as the up and coming NZ PN region. That was the buzz of the recent PN Conference and I would put the Auntsfield sub-region at the head of that.
There are a huge variety of clones used in Martinborough, particularly in the older blocks. I have the Ata Rangi clonal breakdown somewhere. From memory, in Martinborough, there is a lot of 10/5 and Dijon. Worryingly not all of the older blocks are fully Phylloxera resistant.
Cheers, Howard