St. Croix Grape
St. Croix Grape
A Very Hardy, Low-Maintenance Red Grape for Wine and the Table
St. Croix Grape (Vitis 'St. Croix') is a rugged, productive blue-red grape developed by pioneering breeder Elmer Swenson — hardy to roughly -30°F, low in acid, and easygoing enough for first-time growers. It makes soft, fruity red wines and is also pleasant for fresh eating and juice. Vigorous and disease-tolerant, it's self-fertile and needs only full sun and a sturdy trellis. Whether you're starting a backyard vineyard in Edina, covering an arbor in Maple Grove, or growing easy grapes in Woodbury — St. Croix thrives in zone 4b–5a (and colder) gardens.
St. Croix Grape Plant Details
| Attribute | Detail |
|---|---|
| Scientific Name | Vitis 'St. Croix' |
| Plant Type | Deciduous fruiting vine (wine & table grape) |
| Mature Length | 15–20+ feet on a trellis; train to your system |
| Sun | Full sun (8+ hours) for ripening and sugar |
| Water | Moderate while establishing; fairly drought-tolerant once rooted |
| USDA Zones | 3–8 (Twin Cities is zone 4b–5a); hardy to about -30°F |
| Soil | Well-draining; tolerates a range of soils. Avoid wet, low spots; good air drainage reduces disease. |
| Pollination | Self-fertile — a single vine will fruit |
| Use | Soft, fruity red wine; also good for fresh eating and juice |
| Harvest | Late August to early September in the Twin Cities; ripens early |
| Winter Hardiness | Excellent — to roughly -30°F |
St. Croix Grape Uses in Minnesota Landscapes
Easy backyard vineyard
Its low acidity and forgiving nature make St. Croix a great first grape. Train it on a two-wire trellis in full sun in a Plymouth yard.
Arbors and screens
Vigorous enough to cover an arbor or pergola for summer shade plus a fall harvest in Eden Prairie.
Wine, juice, and fresh eating
It makes soft, approachable reds and is also enjoyable off the vine and as juice — a versatile family grape.
Best Time to Plant St. Croix Grape in Minnesota
Plant in spring (late April–May) after hard frost so the vine has a full season to establish. Fall planting is not recommended for grapes here. Never plant after mid-October.
How to Plant St. Croix Grape
- Choose the sunniest, best-drained spot — a south or west slope is ideal for ripening and air drainage.
- Install the trellis before or at planting; grapes need sturdy support from year one.
- Dig a hole 2–3× the root width; backfill with native soil and some compost. Don't over-fertilize.
- Space vines 6–8 feet apart along the trellis.
- Water in well and mulch lightly, keeping mulch off the trunk.
- The first two years, train a single strong trunk and remove fruit so the vine builds structure.
Watering St. Croix Grape in Minnesota
First Year Watering Schedule
- Weeks 1–2: Every 2–3 days, deep and slow
- Month 1–2: Every 4–5 days
- Month 3–6: Weekly; deep but infrequent watering encourages deep roots
- Stop watering 2–3 weeks before ground freeze (typically late October in the Twin Cities).
After Year One
Established vines are fairly drought-tolerant; water only during extended dry spells. Avoid a constantly wet root zone, which invites disease.
Is St. Croix good for beginners?
Yes — it's low-acid, disease-tolerant, and forgiving, making it one of the easiest hardy grapes to grow and vinify.
When and how do I prune it?
Prune in late winter while dormant, removing about 80–90% of last year's growth. Grapes fruit on new shoots from one-year-old wood.
Will it survive a Minnesota winter?
Yes — to about -30°F. No burial needed; site it for good air drainage.
You May Also Like
- Frontenac Grape — a bolder, very hardy red
- Marquette Grape — a complex, structured hardy red
- La Crescent Grape — an aromatic hardy white