Winegrowers Supplies -  Vine variety information

Sirius  (originally known as Gf. Ga-51-27)

Mother: Bacchus
Father: Villard Blanc (Seyve Villard 12-375)

A white Piwi/disease-resistant variety.

Year of breeding: 1964
Country of origin: Germany
Breeder/License holder: Bundesforschungsanstalt für Rebenzüchtung Geilweilerhof, Siebeldingen/Rheinpfalz
Number of clones: 0

Year of entry into the German Federal Office's Varieties Register: 1995
Area planted in Germany in : hectares
Area planted in England: unknown

Wine Character:-
        - colour: yellow-green
        - bouquet: a pleasant fruity aroma
        - palate: strong, fruity, similar to Riesling


photo by Julius Kühn-Institut (JKI), Federal Research Centre for Cultivated Plants, Institute for Grapevine Breeding Geilweilerhof - 76833 Siebeldingen, Germany.

Time of bud-burst: early to middle, hence can be susceptible to late Spring frost.

Strength of growth: strong
Growth of side-shoots: very low

Flowering time:
Flowering strength: very high

        - size: medium
        - shape: three-lobed and slightly curved
        - colour: bronze, spotted young leaves are hairy like a cobweb
        - surface undulation:
        - petiolar sinus: open lyre

Grape bunch:
        - size: large, 'shouldered'
        - density: loose
        - size: large
        - shape: round
        - skin colour: greenish-yellow

Time of veraison: middle to middle-early
Time of harvest: needs to ripen well, so needs a good site

Grape yield: very high, reliable
Must-weight: medium
Must-acidity: medium

Wood ripening: good
Winter hardiness: very good
Wood colour:

Resistance against:
        - Oidium: medium-high
        - Peronospora: very high
        - Botrytis: high
        - Roter Brenner:
        - Phomopsis:
        - Stem-atrophy: sometimes less than average
        - Chlorosis:

Preferred soil:
Suitable rootstocks: SO4 or 5BB

Normal stem height:
Normal row spacing: 1.8 to 2.0m
Vine spacing in the row: 

Winter Pruning:                      eyes/buds per sq. metre of land occupied by the plant.

Advantages: Very high yield. 

Disadvantages: A good site is necessary.