Alnus incana subsp. rugosa
The Speckled Alder is a fast-growing native shrub that thrives in wet soils and challenging landscapes where many other plants struggle. Known for its nitrogen-fixing ability, upright multi-stem form, and early-season catkins, this hardy shrub plays a vital role in soil improvement and ecosystem restoration.
Commonly found along streambanks and wetlands, Speckled Alder is ideal for erosion control, wildlife habitat, and naturalized plantings that prioritize function as much as beauty.
AttributeDetails🌿 Botanical NameAlnus incana subsp. rugosa🏷️ Common NamesSpeckled Alder, Tag Alder🌳 Mature Height10–20 feet🌐 Mature Width8–15 feet📈 Growth RateFast (2–3 feet per year)⏳ Lifespan40–60 years🧊 USDA Zones2–6❄️ Chill Hours800–1,200 hours☀️ Sun PreferenceFull sun to partial shade🧱 Soil TypeMoist to wet soils; tolerates clay, loam, sand⚖️ Soil pHSlightly acidic to neutral (5.5–7.0)💧 Water NeedsHigh; thrives in wet or saturated conditions🌸 Flower TypeYellowish-green catkins; early spring🍒 Fruit TypeSmall woody cones; not edible🐝 PollinatorsSupports early pollinators; wind-pollinated🌿 Growth HabitUpright, multi-stemmed, thicket-forming↔️ Spacing8–12 ft apart for mass plantings🏡 Landscape UsesWetland restoration, erosion control, riparian buffers🧹 Maintenance LevelLow
🌱 Fixes nitrogen in the soil, improving fertility for surrounding plants
🌧️ Excellent for stabilizing streambanks and preventing erosion
🐦 Provides habitat and cover for birds and small wildlife
🌿 Supports early-season ecosystems when few plants are active
✅ Pros⚠️ Cons🌱 Improves soil naturally through nitrogen fixation🌊 Requires consistently moist or wet soil to thrive⚡ Extremely fast-growing and effective for quick coverage🌿 Can spread aggressively in ideal conditions🧬 Native species with strong ecological benefits🍂 Not known for ornamental flowers or showy features🌧️ Ideal for difficult, wet, or erosion-prone sites✂️ May require management to control thicket formation🐦 Great wildlife shelter and habitat plant🌳 Can become large and dense over time
🛁 Water thoroughly before and after planting, especially in drier soils
🕳️ Plant in a wide hole at the same depth as the root system
🌾 Mulch to retain moisture and suppress competing weeds
💦 Ensure consistent moisture; do not allow soil to dry out
✂️ Prune as needed to manage spread or shape thickets
🧪 Fertilization is rarely needed due to nitrogen-fixing ability
The Speckled Alder is a workhorse native shrub built for function, resilience, and environmental impact. Perfect for wet areas, restoration projects, or natural buffers, it improves soil, supports wildlife, and establishes quickly where other plants fail.
Alnus incana subsp. rugosa
The Speckled Alder is a fast-growing native shrub that thrives in wet soils and challenging landscapes where many other plants struggle. Known for its nitrogen-fixing ability, upright multi-stem form, and early-season catkins, this hardy shrub plays a vital role in soil improvement and ecosystem restoration.
Commonly found along streambanks and wetlands, Speckled Alder is ideal for erosion control, wildlife habitat, and naturalized plantings that prioritize function as much as beauty.
AttributeDetails🌿 Botanical NameAlnus incana subsp. rugosa🏷️ Common NamesSpeckled Alder, Tag Alder🌳 Mature Height10–20 feet🌐 Mature Width8–15 feet📈 Growth RateFast (2–3 feet per year)⏳ Lifespan40–60 years🧊 USDA Zones2–6❄️ Chill Hours800–1,200 hours☀️ Sun PreferenceFull sun to partial shade🧱 Soil TypeMoist to wet soils; tolerates clay, loam, sand⚖️ Soil pHSlightly acidic to neutral (5.5–7.0)💧 Water NeedsHigh; thrives in wet or saturated conditions🌸 Flower TypeYellowish-green catkins; early spring🍒 Fruit TypeSmall woody cones; not edible🐝 PollinatorsSupports early pollinators; wind-pollinated🌿 Growth HabitUpright, multi-stemmed, thicket-forming↔️ Spacing8–12 ft apart for mass plantings🏡 Landscape UsesWetland restoration, erosion control, riparian buffers🧹 Maintenance LevelLow
🌱 Fixes nitrogen in the soil, improving fertility for surrounding plants
🌧️ Excellent for stabilizing streambanks and preventing erosion
🐦 Provides habitat and cover for birds and small wildlife
🌿 Supports early-season ecosystems when few plants are active
✅ Pros⚠️ Cons🌱 Improves soil naturally through nitrogen fixation🌊 Requires consistently moist or wet soil to thrive⚡ Extremely fast-growing and effective for quick coverage🌿 Can spread aggressively in ideal conditions🧬 Native species with strong ecological benefits🍂 Not known for ornamental flowers or showy features🌧️ Ideal for difficult, wet, or erosion-prone sites✂️ May require management to control thicket formation🐦 Great wildlife shelter and habitat plant🌳 Can become large and dense over time
🛁 Water thoroughly before and after planting, especially in drier soils
🕳️ Plant in a wide hole at the same depth as the root system
🌾 Mulch to retain moisture and suppress competing weeds
💦 Ensure consistent moisture; do not allow soil to dry out
✂️ Prune as needed to manage spread or shape thickets
🧪 Fertilization is rarely needed due to nitrogen-fixing ability
The Speckled Alder is a workhorse native shrub built for function, resilience, and environmental impact. Perfect for wet areas, restoration projects, or natural buffers, it improves soil, supports wildlife, and establishes quickly where other plants fail.
