I think I believe in
terroir,
I do. Wines that taste of a place. An identification with stones, earth, soil,
salty or foreign winds, fog and weather that all play their role in maintaining
and augmenting this belief. Or care free
holidays. But, for my sins, I am also
somewhat rational, and wonder, and perhaps sometimes fear, that what I think is
terroir might be explained by something
more banal. A consistently good
winemaker perhaps. Or some particularly
smart viticulture. Or maybe the grapes
themselves are behind it all. And this
latter point gave me the idea for this article.
And since I happen to like cabernet sauvignon, the somewhat less
travelled path of which clones are used by some of my favourite Australian cabernet
producers beckoned. Here I should note
that I am indebted to the wineries mentioned for taking the time to answer my
silly questions.
First, let’s start with something really obvious, namely
what’s a clone? According to The Oxford Companion to Wine (3rd
Ed, 2006) (“Oxford Companion”),
a clone “in a viticultural context is a
single vine or a population of vines all derived by vegetative propagation from
cuttings or buds from a single ‘mother vine’ by deliberate clonal selection”. So think plant cuttings, rather than seeds.
What then cabernet sauvignon clones are out there? Romance and clonal identification of grape varieties
appear not to be correlated. Though more
than a couple of pinot noir drinkers will know off-hand whether the MV6 or
other clone is in use, a similar appetite for alphanumerics is not something
that I have yet detected in those who enjoy cabernet. The main protagonists in the cabernet world appear
to be the unhappily named C125, CW44, FPS12, G9V3, LC84, LC10, LC14, PDFS,
Q390-05, R2V11, SA124, SA125, SA126, Reynella Selection and WA Cape Selection. And please don’t take this as an implied advocacy for
one grape variety over another. My
taste buds prefer the democracy of not being required to choose.
So, what can we expect from these particular clones? An article authored by Nick Dry, viticulturalist
at the Yalumba Nursery entitled “Yalumba
Nursery: The Coonawarra Cabernet Sauvignon Clonal Trial” published in the
May/June 2011 issue of the Wine and
Viticulture Journal (and kindly brought to my attention by Nick) provides
guidance on more than of a few of these:
·
CW44 is the first “Coonawarra clone” and was selected from the Richardson’s block
by the Department of Agriculture and released in 1980. It is said to be a moderate yielding clone
that produces good fruit flavours;
·
the FPS12 was imported in 1991 from Foundation
Plant Services in California, via Chile in 1971 and prior to that a selection
from Bordeaux in the 1880s.
·
G9V3 is from the Foundation Plant Services in
California;
·
PDFS is the “Plants de France Selection” from
Michel Colomb in 2011. This is said to
produce moderate yields with medium sized berries. A trial in Coonawarra in 2007 suggested it to
have vigour, capsicum like flavours and quite good tannin ripeness but also quite acidic;
·
the Q390-05 was imported from the Centre for
Plant Health in Sidney, British Columbia Canada and arrived in Canada from a
private source in France. A trial in Coonawarra in 2007 suggested it to
have low vigour, small bunches, good tannin and flavour ripeness, and good
maturity of flavour and tannin for its baume;
·
SA125 was selected from the Dorrien Vineyard in
the Barossa Valley and is widely planted in South Australia. It is described as a low yielding, early
ripening clone that produces wines with good intensity and ripe tannins. SA126 was also selected from the Dorrien
Vineyard;
·
the Reynella selection is a mass selection
traceable to the Reynella vineyard in McLaren Vale planted in the 1840s. It is generally low yielding, but can produce
inconsistent yields from season to season and performs better in warmer
years. “Mass selection” according to the
Oxford Companion means “when many vines
are selected to provide budwood” and “the identity of the individual vines is
not maintained”. Logically, it is therefore a cost effective means of propagation; and
·
the WA Cape Selection is a selection of 21 vines
at Houghtons in the late 1960s originally sourced from selections from South
Africa more than 100 years ago. A trial
in Coonawarra in 2007 suggested more acid than tannin, good growth habit and
low vigour.
And finally, and perhaps most importantly from a wine consumer's perspective, who says they use
what? Here are some anecdotal insights:
·
Tahbilk suggest that plantings in the 1980’s
were all G9V3 but other earlier and later plantings and the source of all
planting material are not known. The
peppermint and eucalyptus characters of the G9V3 clone are considered attractive;
·
Balnaves indicate that they have several
different clones of cabernet sauvignon but the best results to date seem to be
coming from the ‘Reynella Selection’ source of cabernet sauvignon. The
selection seems to be less biannual in bearing, seems to cope better with
stress and produce complex flavours;
·
over at De Bortoli, all premium cabernet wine is
made from SA125. Depending on the site
SA125 tends to have less methoxypyrazine characters (herbaceous, bell pepper
aromas) than other clones, but all clones are susceptible to bud mite damage
and eutypa symptoms as they age;
·
at Yeringberg, the first cuttings planted were said
to be from Great Western, and from the same (unknown) source as that planted at
Mount Mary. A number of years later
Yeringberg obtained cuttings from Seville Estate, from clone SA126. The fruit from both plantings is fermented
together;
·
Vasse Felix’s cabernet clones are mainly the Houghton
clone, but they do have some SA125 and
SA126 planted. SA125 is said to be low yielding and to have deeper, more blackberry fruits
and a tough tannin structure. SA126 is said
to be higher yielding and tends to be a bit more herbaceous and lighter in
weight and is not regarded as a preferred clone;
·
at Majella, the first cabernet sauvignon vines
were planted in 1970. There
are small plantings of C125, LC84, R2V11 clones, but most of the plantings owe
their heritage to the original Majella "selection"; and
·
Yalumba indicate that over the last twenty years
they have used most clones, but have had most consistent success with Reynella and SA125. Other clones such as CW44 and G9V3 perform
better under some seasonal conditions or on different soil types.
This
is of course but a snapshot of cabernet sauvignon and the various clones in use around
Australia. And I must admit I found this fun to write. Clearly, however, many wineries take clonal selection very seriously indeed. If nothing else, I hope this article might add to a stimulation of thought on how important, or not, factors such as clonal selection
might be to the ultimate flavours of wine.
It may be more important than is
perhaps sometimes given credit.
See
also RM Cirami, MG McCarthy and PR Nicholas, “Clonal selection and evaluation
to improve production of Cabernet Sauvignon grapevines in South Australia”, (1993)
33 Australian Journal of Experimental
Agriculture 213-20.