Château Canon surrounds Vieux Château Mazerat on three sides and by Château Angelus on the west. The Vineyard is stuck in the middle of ‘Cru Classé’ territory and faces Château Beausejour Duffau Lagarosse. The vineyard is comprised of 35 very old Cabernet Franc vines and 65 Merlot on clay over limestone. The vineyard yield is held down to 30 hectoliters per hectare, the vines are pruned on the double guyot system The secondary shoots are removed and two runs of green harvesting completed to achieve no more than four bunches of grapes per vine, at mid véraison. The grapes are handpicked into small trays before transfer to the winery. The vines are pruned on the double guyot system. The secondary shoots are removed and two runs of green harvesting are completed in order to achieve no more than four bunches of grapes per vine, about thirty hectolitres per hectare. The grapes are handpicked into small trays before transfer to the winery.

On arrival at the winery, the trays are emptied onto the first vibrating sorting table where grapes that do not attain normal fruit set are automatically removed through grilles. Six sorters remove any bunches that do not conform to an acceptable standard. After de-stemming a second vibrating sorting table, manned by up to four additional sorters, removes any un-heterogeneous berries and any other extraneous matter. No must-pumps are used - with all transfers being made by conveyors. The fruit that arrives in the modern wooden vats is, therefore, excellent material to work with. Pre-fermentation maceration under gas and at a cool temperature is affected. Fermentation is conducted at relatively high temperatures. The wine, once primary fermentation is completed, is worked through the skins using ‘pigeage’ and classic pumping over methods. Malolactic fermentation is achieved in new French oak and the wine is barrel aged in a climate-controlled cellar at 14 C. Racking is done on a traditional basis using ‘esquives’ and gravity every three months.

David Peppercorn, in his eighties book BORDEAUX, stated that if the then proprietor was to buy some oak barrels there would be no reason why Vieux Château Mazerat shouldn’t be a CRU CLASSÉ like all of its neighbors.