How to Grow Magnum Hops
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Magnum Hops
Humulus lupulus 'Magnum'
vineMagnum is a high-alpha bittering hop variety widely used in brewing for its clean, herbal bittering qualities with subtle citrus and pine notes. This vigorous perennial vine produces large cones packed with resins valued by craft brewers worldwide. It's a dual-purpose hop that can also contribute subtle flavor when used later in the boil.
When should you plant Magnum Hops in your zone?
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Example Magnum Hops timeline · Pittsburgh, PA (Zone 6b)
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Plant Magnum Hops
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Magnum Hops
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Zones 4-8; thrives in cool to temperate climates with distinct seasons
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Establishment (Year 1)
5-6 monthsSlow growth from rhizome cuttings; vines emerge in spring and may reach 4-6 feet by fall
Focus on root development. Provide support structure (string or trellis). Remove any early flowers. Keep soil consistently moist. Mulch heavily to retain moisture and regulate temperature.
Vegetative Growth (Year 2-3)
4-5 months during growing seasonVigorous twining growth, 15-18 feet tall; dense foliage with palmate leaves; first small cone development may occur late in season
Train vines to trellis system. Fertilize monthly with balanced formula. Manage lateral shoots for optimal plant structure. Continue removing flowers in first 2 years to build plant vigor.
Cone Development & Flowering (Year 3+)
6-8 weeks from flowering to cone setFemale flowers form in clusters along lateral stems; small green cones develop throughout mid-to-late summer; cones swell and become papery
Apply potassium-rich fertilizer once flowers appear. Ensure excellent drainage to prevent mold. Monitor for powdery mildew. Thin dense foliage for air circulation. Hand-pollination not necessary (female plants produce seedless cones).
Maturation (Late Summer to Early Fall)
3-4 weeksCones reach full size, feel papery and slightly dry to touch; color transitions from green to golden-brown; resin glands (lupulin) are visible as yellow powder on cone bracts
Stop fertilizing. Reduce watering slightly. Monitor daily for maturity—over-ripe cones lose alpha acids. Check for spider mites and downy mildew during humid conditions.
Harvest & Dormancy
2-4 weeks harvest window; dormancy 5-6 monthsPick fully mature cones; dry immediately. Foliage yellows in fall; vines die back to ground; underground rhizomes enter dormancy
Harvest before first frost or high humidity causes mold. Dry cones to 10% moisture content using dehydrator, kiln, or well-ventilated space (not direct sun). Store dried cones in vacuum-sealed bags at cool temperature. Cut back dead vines to 3-4 inches above ground; apply mulch for winter protection in zones below 6.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with neem oil or insecticidal soap in early morning or late evening. Increase humidity. Remove heavily infested leaves. Monitor in dry, warm conditions.
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Strong water spray to dislodge. Insecticidal soap for moderate infestations. Organic neem oil. Avoid broad-spectrum insecticides that kill beneficial predators.
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Improve air circulation by thinning foliage. Remove affected leaves promptly. Avoid overhead watering. Apply sulfur or copper fungicide if severe. Plant in well-drained soil.
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Space plants adequately for air flow. Dust with elemental sulfur weekly starting early season. Remove infected foliage. Neem oil spray in cool evening hours.
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Hand-pick early morning when beetles are sluggish. Use Japanese beetle traps away from plants. Milky spore in soil for larvae. Neem oil for heavy infestations.
Uses
Beer Brewing
CulinaryMagnum is a premium bittering hop prized in brewing for its clean, herbal profile with subtle citrus and pine undertones. It's used primarily during the 60-90 minute boil to impart bitter International Bitterness Units (IBU) to beer styles ranging from pilsners to IPAs without overwhelming floral or fruity notes. [source]
Herbal Infusions & Sleep Support
MedicinalHops have been traditionally used in herbal medicine for relaxation, nervous tension, and sleep support. The compound humulone (in lupulin) has been studied for sedative properties and is used in herbal tea blends and tinctures. [source]
Dream Pillows & Aromatherapy
HouseholdDried hop cones are traditionally filled into small pillows placed under the head to promote restful sleep and vivid dreams. The aromatic resins have a calming herbal scent valued in botanical aromatherapy. [source]
Ornamental & Architectural Garden Feature
CraftMagnum hops grow as a striking ornamental vine with attractive palmate foliage and papery golden cones that persist into fall. It's ideal for covering arbors, pergolas, or trellises as a natural privacy screen with both aesthetic and functional value. [source]
Pollinator & Bird Support
WildlifeHop flowers attract bees and other pollinators during summer. Mature cones provide food and shelter for beneficial insects and birds through late fall and into 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
Harvest cones in late August to early September when they feel papery-dry, smell strongly aromatic with citrus/pine notes, and yellow resin glands (lupulin) are visible when squeezed lightly. Cones should have a slight crackling feel. Dry immediately in a kiln, dehydrator, or well-ventilated drying room at 90-110°F for 4-7 days until moisture content reaches ~10%. Store in vacuum-sealed bags or airtight containers with oxygen absorbers in cool (40-50°F), dark conditions for up to 1-2 years. Alpha acid content peaks at this time and declines during storage.
Fun Facts
- 🌱 Magnum was developed in 1980 by Hallertau breeders in Germany and has become one of the most commercially planted hop varieties worldwide, used in billions of beers annually.
- 🌱 Hop plants are dioecious (separate male and female plants); only female plants produce the cone flowers used in brewing, and seedless cones are more valued because seeds reduce alpha acid purity and add astringency.
- 🌱 A single mature hop plant can produce 1-2 pounds of dried cones annually after year 3, and the same plant's rhizome can remain productive for 15-20+ years with minimal maintenance.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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