University of Idaho - I Banner
A student works at a computer

VandalStar

U of I's web-based retention and advising tool provides an efficient way to guide and support students on their road to graduation. Login to VandalStar.

Contact Us

Physical Address:
1200 West Palouse River Drive

Hours:
Open everyday, dawn to dusk, free admission

Contact:
arboretum@uidaho.edu

Mailing Address:
875 Perimeter Drive MS 2281
Moscow, Idaho 83844-2281

Directions

Arboretum & Botanical Garden Bulletin Board

Plant of the Month

Coastal Redwood
Sequoia sempervirens
Location: Grid O18 West side gravel road, up the slope from the Peek bench (the bench with a keystone block retaining wall).

The Coastal Redwood really has no business surviving in Moscow, Idaho, but surprisingly we have two living in the Arboretum. The older of the two was planted in 2019. Coastal Redwoods are native from Northern California north into Oregon in a narrow band between the ocean and the summits of the Coast Range mountains. The climate of that area is mild with lots of precipitation and very frequent fog.

Coastal Redwood, Sequoia sempervirens; taken Jan. 22, 2024
Coastal Redwood, Sequoia sempervirens Jan. 22, 2024

Some references say the Coastal Redwood is zone 7 (0-5° F), and others list it as zone 8 (10-15° F), but either of those are reserved from the -22°F it survived in the Arboretum last winter. It did freeze back most of the top growth last year, but it re-sprouted and grew quite a bit last summer.

New growth, Coastal Redwood, Sequoia sempervirens; taken Jan. 22, 2024
New growth, Coastal Redwood, Sequoia sempervirens Jan. 22, 2024

It is probably still too soon to tell, but for now I did not see any obvious damage from the severe cold we had last week.

Monthly Projects

Winter finally decided to make an appearance in Moscow last week, although our version was still mild compared to lots of other places. The lowest ‘official’ low temperature I saw was -16° F, certainly cold enough to damage some of the less hardy things we are trying to grow. The good news is that we also got about 6 inches or so of snow before the cold showed up, so at least some plant crowns and such at ground level did have some insulation. Undoubtedly there will be some damage, and undoubtedly there will be surprises both ways — what was damaged and what was not.

Upper pond, ice and snow; taken Jan. 22, 2024
Upper pond, ice and snow Jan. 22, 2024

Even after a fairly dramatic warm up, and three days of rain, not a lot of the snow has melted, and unfortunately, the upper pond still has not filled up after dropping to record low levels last summer.

Broken trees in the Shattuck Arboretum; taken Jan. 11, 2024
Broken trees, Shattuck Arboretum Jan. 11, 2024

Upcoming Events

  • No current events

When visiting the Arboretum, please remember that for your safety, the safety of others and for the protection of wildlife and plant collections, no pets are allowed. Ice on ponds is very unstable—stay off the ice.

Contact Us

Physical Address:
1200 West Palouse River Drive

Hours:
Open everyday, dawn to dusk, free admission

Contact:
arboretum@uidaho.edu

Mailing Address:
875 Perimeter Drive MS 2281
Moscow, Idaho 83844-2281

Directions