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Western Green Alder

Alnus viridis sinuata

Height: 15' average mature height
Zones: 5-9 Find my zone
Aspect: mostly sun to full sun
Watering: needs regular irrigation, about once per week during hot weather
Maximum Water: tolerates wet soils with occasional summer flooding
Habit: clump forming with multiple stems
Foliage: deciduous
Native To: AK, CA, ID, MA, ME, MI, MN, MT, NC, NH, NY, OR, PA, TN, VT, WA, WI, WY
Size Availability

quart - $10.00 each
10 in stock
Bulk Pricing: $8.50 each for 5 or more - 15% off
Bulk Pricing: $7.50 each for 10 or more - 25% off
Bulk Pricing: $6.50 each for 100 or more - 35% off
Ships free with orders of $75!*
Packed with a bagged root ball.
1 gallon - $15.00 each
5 in stock
Bulk Pricing: $10.00 each for 5 or more - 33% off
Ships free with orders of $75!*
Packed with a bagged root ball.
Production notes: in production most years but is unavailable in some due to limited seed/division material or finicky propagation
Western Green Alder, otherwise known as Sitka Alder, is a fast growing shrub native across the Pacific Northwest into northern California and is an important riparian species for a wide range of species. Green Alder is a host species for the caterpillars of many native butterflies and the seeds are an important winter food source for birds when little else is available. Unlike most plants that drop their seeds in the fall, the cones of Green Alder hold the seeds for as long as three years after ripening which gives birds a chance to find them in late winter and early spring. 

Alders are nitrogen fixing plants and can grow quickly even in poor soils, quickly building up good soil organic matter that supports other species. Alders often quickly colonize areas after disturbances such as intense fires or landslides and rebuild the topsoil which allows later successional trees to establish. Unlike some of the tree forms such as Red or White Alder, Green Alder resprouts from the roots after being cut and coupled with the fast growth this makes Green Alder a great choice for coppicing. Individual plants tend to form clumps about ten feet wide and twenty feet tall when given space, although in shadier environments they can grow as single trunk small trees. Green Alders prefer growing in moist soils and are tolerant of flooding, they can survive some drought but do best when given even moisture throughout the summer. 
Alnus viridis sinuata - Western Green Alder with young and mature cones
Source: Commons
Alnus viridis sinuata - Western Green Alder - the cones hold seeds through the winter
Source: Commons
Alnus viridis sinuata - Western Green Alder shrub
Source: Commons
Alnus viridis sinuata - Western Green Alder growing in a mountain valley

Packing Plants For Shipping

We pack our plants depending on the needs of each species and size, most plants ship best with the roots packed in moist sawdust or bark fines but some species don't like root disturbance and are shipped in a soil-less growing media.

Excess soil is washed from the roots in preparation for shipping (18-24" White Pines)

Plants are bundled together to fit in boxes

Bundles of plants are secured in long boxes.

Plant Sizes


3 gallon Dawn Redwood

Standard quart shrub

Standard 14-18" multi-stem tree size

Standard deep plug pine tree

Bamboo Plants Are Shipped In Their Containers

Bamboo roots are not flexible and so plants have to be shipped in their containers. These plants are heavier and are shipped separately from bare root plants. Because they are potted they can handle longer transit times so can ship via UPS Ground instead of USPS Air Mail. Potted plants can also be shipped year-round.

We regularly top our 1 gallon bamboo plants at 24-30 inches tall throughout the growing season. This results in dense, bushy foliage while allowing for economical shipping. From this size most running species will grow to 5-6 feet tall in the first spring and clumping species will usually grow to 4-5 feet tall.

1 gallon bamboo plants strapped in and ready to be sealed.

Unpacking Bare Root Plants

You will be sent tracking details as soon as your plants are shipped. Unpack your plants as quickly as possible after they are delivered. We use two types of boxes, side-sealing and top-sealing. For boxes that are taped along the whole length you can cut the tape on either side and remove the plant bundles by cutting the tape holding the bundle to the bottom. For boxes that are sealed on the top and bottom, it is easiet to open the bottom of the box (the shipping label is at the top) and pull the bundle of plants out straight out. Check that the box is empty as there can be a second bundle of plants stuck towards the top.


A bundle of trees.
When you are ready to plant, remove the trees from the plastic and soak the roots in a bucket of water for 30 seconds. Do not expose the roots to direct sunlight and do not allow them to dry out. When planting large quantities of plants we keep the plants in a black garbage bag to keep all sun and air flow away from the roots and pull each plant as soon as the planting hole is ready. Water the soil well right after planting.

What if I am not able to plant right away?

You can usually leave the plants in their shipping container unopened for 1-2 days if there were no shipping delays and you have received your plants from late November through February. Plants shipped when it is warmer can't stay in their packages for as long.

For longer term storage of plants you can pot them up or plant them in rows close together temporarily and then pull them out later in the spring to be planted again. This keeps the roots moist while allowing for air flow to the tops. The roots should have good contact with the soil to ensure they have access to adequate moisture.
Size Availability
quart - $10.00 each
10 in stock
Bulk Pricing: $8.50 each for 5 or more - 15% off
Bulk Pricing: $7.50 each for 10 or more - 25% off
Bulk Pricing: $6.50 each for 100 or more - 35% off
Ships free with orders of $75!*
Packed with a bagged root ball.
1 gallon - $15.00 each
5 in stock
Bulk Pricing: $10.00 each for 5 or more - 33% off
Ships free with orders of $75!*
Packed with a bagged root ball.
Production notes: in production most years but is unavailable in some due to limited seed/division material or finicky propagation

* Shipping Rate Information

Most plants that ship with washed roots ship at a flat rate with free shipping for ordres over $75. Some plants, such as bamboo that are shipped potted, have rate tables based on the quantity and delivery location. Washed root plants ship free with any rate table plant even if the total of the washed root plants is less than $75. Delivery surcharges such as Remote Delivery Area are in addition to the standard shipping and are applied by shipping carriers to addresses with excessively long delivery routes, or those with difficult access such as those on islands that require ferries for delivery. Free shipping does not apply to delivery surcharges.
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