Hazel alder (Alnus serrulata)

Hazel alder

Also known as: Brook-Side Alder, Smooth alder

The hazel alder is a small tree common to the United States. It is slow growing and takes about ten years to reach maturity. It prefers the moist soil of riverbanks and creek beds. This tree or large bush bears fruit that resembles a pinecone.

Scientific classification

Species

Hazel alder (Alnus serrulata)

Beeches, walnuts, and allied trees

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Perennial

Lifespan

Tree, Shrub

Plant Type

Spring, Winter

Bloom Time

Summer

Harvest Time

3 m to 4.5 m

Plant Height

2.5 m to 4.5 m

Spread

Green, Orange

Leaf Color

5 cm to 10 cm

Flower Size

Brown, Copper

Fruit Color

Red, Brown, Yellow, Green, Burgundy, Gold

Flower Color

Images of Hazel alder

Attributes of Hazel alder

Growth Rate

With a rapid growth rate, hazel alder efficiently employs the spring and summer seasons, ushering in a burst of active leaf production and a pronounced increase in height. This dynamic growth period underscores the plant's adaptability, leading to elaborate floral displays during high summer, a direct manifestation of this aggressive growth tempo. Hazel alder's growth pace may slightly ebb in inter-season periods, yet its overall progress remains dominantly accelerated during these warmer seasons.

Quickly Identify Hazel alder

Deciduous tree, 10-15 feet (3-4.5 meters) tall

Distinct male and female flowers: yellow-brown and red catkins

1-inch (2.54 cm) fruiting cones with winged nutlets

Dull green leaves with saw-like teeth, 2-4 inches (5-10 cm)

Smooth gray bark with inconspicuous lenticels, sleek appearance

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Care Guide for Hazel alder

Every 3 weeks

Water

Full sun

Sunlight

5 - 32 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Thriving in wetlands, hazel alder prefers consistently moist soil and shows moderate drought tolerance. A watering schedule of every three weeks supports optimal hydration. Commonly found along stream banks, hazel alder is ideal for riparian plantings, contributing to erosion control while enjoying ample water supply.

Fertilize: For hazel alder, use balanced or high nitrogen fertilizers early in the growing season, every two months, to promote growth without over-fertilizing. Adjust amounts for younger plants or during dormancy, and always follow safety guidelines for application. This ensures healthy development and strong root systems.

Pruning: Hazel alder features serrated leaves and dense growth, thriving with early spring pruning. Trim dead branches, reduce overgrown stems for air and light, and thin interior growth to support new shoots. Avoid heavy late-season pruning to reduce stress. Regular maintenance fosters robust growth and enhances structure.

Propagation: Hazel alder thrives in various environmental conditions and is ideal for sowing. Use viable seeds from mature specimens and ensure even moisture in well-draining soil for root development. Seed stratification may be needed to promote germination. Maintain consistent moisture and protect young saplings from extremes.

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