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Perhaps a columnar Gingko: 'fastigiata' would hold it's golden autumn leaves through the Fall.
Looks like a fig.
I'd tend towards birds as the culprit, but others are involved: the bird feeder brings them in, the ants may have a few aphids grazing and...
According to www.paghat.com, the berries are "edible, but not especially tasty....the seeds are mildly toxic, probably not more so than apple...
I believe it is a sculpture shaped like a tree--there is some mention of a large sculpture in the garden, shaped like a tree with women's faces...
I'd guess it's a strand of bull kelp that's become tightly wound...I've seen them washed up on beaches and dried out, and the smaller whips/tips...
And remember: propagation is conservation....
I'd plant a row of clumping bamboo, in particular Fargesia robusta, in light of your site and needs--it will tolerate the shade from the...
Miscanthus 'Giganteus' for Summer (and Fall) interest, adds a tropical look through sheer size and strapping leaves, and exposed canes are...
Petasites japonicus var. giganteus, Sasa palmata (perhaps...you're right on the edge zone-wise), Paulownia tomentosa kept coppiced....
Consider Fargesia rufa, a clumping (and thus well behaved and non-running) bamboo. Fast to establish and evergreen. Depends what you mean by...
I should add that you can avoid a lot of the import hassle (with the less regulated genus/species) by hiring a broker ahead of time--for a nominal...
In my experience, Prunus is very difficult to import: you have to find a nursery willing to do the (to them) tedious and expensive treatments...
The process is somewhat tedious, but not that difficult. First stop should be the Canada Customs Automated Import Reference System (AIRS), which...
Perhaps a Lespedeza.....