How to Grow Excalibur Apple

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Excalibur Apple

Malus domestica 'Excalibur'

tree

Excalibur is a disease-resistant apple cultivar developed by the University of Illinois, known for its exceptional resistance to apple scab and cedar apple rust. It produces medium-sized, red apples with crisp, juicy white flesh and a balanced sweet-tart flavor. The tree is vigorous, semi-dwarf, and well-suited to home orchards and commercial operations.

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Example Excalibur Apple timeline · Pittsburgh, PA (Zone 6b)

Plant Excalibur Apple
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Excalibur Apple
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Excalibur Apple dates for your own zip code.

Growing Conditions

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Sun: Full sun, minimum 6-8 hours daily; 8+ hours preferred for best fruiting and disease resistance

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Water: Moderate and consistent; 1-2 inches per week during growing season. Deep watering during dry periods; avoid waterlogging. Reduce frequency in fall to encourage dormancy.

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Spacing: 240 inches

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Days to maturity: 3-4 years to first significant fruit production; full bearing at 6-8 years

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Planting depth: Plant at same depth as nursery container; graft union should be 4-6 inches above soil line

Soil

Type: Well-draining loamy soil with good organic matter

pH: 6.0-7.0

Amendments:

Compost aged manure peat moss sulfur if pH is too high

Growing Zones

Find your zone →

Zones 4-7; thrives in cooler climates with moderate chill hours

4a 4b 5a 5b 6a 6b 7a

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Growth Stages

Establishment (Year 1-2)

2 years

Young tree focuses on root and branch development. Little to no fruit produced. Shoots are vigorous and green.

Remove any flower buds the first 2 years. Stake for support. Prune to develop strong scaffold branches. Water consistently. Apply mulch 3-4 inches deep around base.

Juvenile Growth (Year 3-4)

2 years

Tree develops fuller canopy. First small crops appear. Branches become woody. Tree reaches semi-dwarf mature size (15-20 feet).

Thin fruit clusters to 1 apple per 6 inches of branch. Thin branches if overcrowded. Continue training scaffold structure. Fertilize lightly in spring.

Flowering (Spring)

2-3 weeks

Pink and white flower clusters emerge in early to mid-spring. Flowers appear on spurs and 2-year-old wood. Bloom lasts 10-14 days.

Excalibur is partially self-fertile but sets better fruit with compatible pollinizers (Gala, Honeycrisp, Jonathan). Protect from late spring frosts. Ensure adequate bee activity.

Fruiting & Development (Summer)

3-4 months (June-September)

Small hard fruits develop from pollinated flowers. Apples enlarge through June and July. Green skin gradually shows red color.

Thin fruit to 1 apple per 6 inches of branch for larger, higher-quality apples. Remove damaged or diseased fruit. Continue regular watering. Monitor for pests/diseases despite Excalibur's natural resistance.

Harvest & Dormancy (Fall-Winter)

2-3 months

Apples mature to full red color with firm, crisp texture. Tree sheds leaves by late fall. Branches enter dormancy.

Harvest when apples separate easily with gentle twist. Apples store well (3-4 months in cool conditions). Prune in late winter. Apply dormant oil spray if needed for overwintering pests.

Companion Planting

Plan your garden →

Plant with:

Gala apple Honeycrisp apple Jonathan apple Serviceberry Hawthorn Clover Buckwheat

Avoid planting near:

Juglans (Black walnut) Eucalyptus Fennel other apple trees within 10 feet unless positioned for good air circulation

Common Pests

Pheromone traps for monitoring; kaolin clay spray; carbaryl or spinosad if needed; remove fallen fruit. Despite resistance traits, still susceptible.
Yellow sticky traps hung in tree; sanitation of fallen fruit; spinosad or carbaryl in late summer if infestations detected
Insecticidal soap; horticultural oil; reflective mulches; avoid excess nitrogen fertilizer
Increase humidity; strong water spray; miticide if severe; predatory mites

Uses

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Fresh eating and storage

Culinary

Excalibur apples have crisp, juicy white flesh with a balanced sweet-tart flavor, making them excellent for fresh eating. Their firm texture and low browning make them ideal for salads and charcuterie boards, and they store exceptionally well for months in cool conditions. [source]

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Sauce, cider, and baking

Culinary

The balanced acid and sugar content makes Excalibur well-suited for applesauce, cider, and baking applications. They hold their shape during cooking and develop good flavor in pies and cobblers. [source]

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Nutritional value and antioxidants

Medicinal

Like all apples, Excalibur is rich in fiber, vitamin C, and polyphenols (antioxidants). The apple's nutritional profile supports digestive health and overall wellness. [source]

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Disease resistance for low-spray growing

Household

Excalibur was specifically bred for exceptional resistance to apple scab and cedar apple rust, major apple diseases. This allows home gardeners to grow delicious apples with minimal fungicide applications, making it ideal for organic orchards. [source]

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Pollinator and wildlife support

Wildlife

Apple blossoms attract bees and other pollinators; the tree provides food and habitat for various bird and insect species. Fallen apples feed wildlife during fall and winter. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Excalibur apples mature in mid-to-late September to early October. Pick when fully red, firm, and apples separate easily with a gentle twist. For optimal flavor, allow vine ripening rather than early harvest. Store in cool conditions (32-40°F) for up to 3-4 months. Use both fresh and for cooking/sauce.

Fun Facts

🌱 Excalibur was developed by the University of Illinois breeding program specifically for disease resistance, combining the hardiness of Priscilla with better fruit quality.
🌱 Despite its strong disease resistance to apple scab and cedar apple rust, Excalibur still requires monitoring and basic pest management for codling moths and other common apple pests.
🌱 The name 'Excalibur' references the legendary sword, symbolizing the apple's strength and exceptional disease-fighting properties.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Full Sun Mulch

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