Here’s a strange thing. Our little Burgundy truffle truffière, which started producing for the first time this year, is also producing bianchetto (Tuber borchii) truffles. The truffle in the photo was dug up in early March, and I found it because it had cracked the soil above it to create a classic truffle “push up”. At the time, I assumed that it was an unusually large Tuber maculatum truffle, a brownish white truffle species which turns up unasked for in many New Zealand truffières. I regard maculatum as a weed species, though some people have been known to eat it. But…
I sent samples of our first Burgundy truffle to Alexis Guerin and Wang Yun at Plant & Food Research so that they could provide confirmation of species, and also sent along a piece of an unusually large “maculatum” for them to take a look at. The Burgundy truffle is definitely Tuber aestivum/uncinatum, but a look at the white truffle raised Alexis and Wang’s suspicions, and now DNA profiling has shown that the white truffle is actually Tuber borchii — a very tasty premium truffle. We’ve got a trial block of bianchetto-infected trees about 30 metres away from the Burgundy block, but that has not produced truffles (so far).
How the borchii found its way to Burgundy is a mystery. The most likely answer is that some trees were either swapped in the nursery or on planting, because the Burgundy and bianchetto blocks were planted at the same time. Now I have to go and have a look around the borchii block for Burgundy truffles. Confused? Moi?
Bottom line: Limestone Hills is now producing three premium truffle species, and the bloke who planted the trees is actually rather pleased, even if they’re not all where they should be.
Coming soon: vendange 2012 (looking good the night before).