Recommended by Christopher Lloyd in The Adventurous Gardener:

Ailanthus altissima (Tree of Heaven)–Christo recommends stooling this tree to increase the leaf size.  I recently picked up seeds near Denny Park and potted them–would love to get a seedling to eventually add to the exotic part of the garden.  Could especially be useful for me, as it has been used to cure baldness (to what success is not made clear).  I will likely keep it in a container, given its extreme suckering reputation.

Mahonia lomariifolia–blooming in late fall and with an interesting growth habit, I look forward to trying this elegant plant in front of the house.

Eucryphia glutinosa–might be a bit bulky for the garden, but I likely will try it anyway for the flowers in an off season.

Clerodendron bungei (Rose Glory Bower, Peanut Butter Plant)–an interesting plant that Christo mentions as blooming late.  It is fragrant and grows well in Seattle, based on the specimens I’ve seen in the arboretum.

Rhododendron concatenans

Daphne pontica–unusual daphne that should be easier to grow than odora and less invasive that the daphne spurge that grows wild everywhere.  Fragrant, so plan to plant it near a door/window.

Helleborus foetidus–Christo claims this isn’t as dark as you might think–with its cut leaves and chartreuse bell flowers, it can light up dark corners.

Paris polyphylla–truly a plant geek plant, and weird enough to add interest for me most of the year.  I can’t wait to try this one.  According to Christo, it looks great with ferns, so will plant near lady or native sword ferns.

Ozothamnus ledifolius–very interesting Tasmanian shrub with gorgeous leaves and colorful buds opening to white flowers.  Christo notes that it is cheerful and smells of stewed prunes!

Omphalodes cappadocica–gorgeous pure blue flowers and an excellent habit make this one appealing–might work well in the orchard garden.

Ranunculus gramineus–this looks like an ideal plant to site near blue flowers–Christo specifically placed it with Omphalodes.