Was doing advice work today in SE Portland. Small tiny lot with an older home. So back in like 1947, the neighbor behind plants a Giant Sequoia, and it grows it's base over the line. I'm attaching a photos where I messed around tonight. It's not my final suggestion, because my program has limited images. Like it did not have individual split rail fence rails. The tree is so monumental, that the first thing that came to mind was GENERAL SHERMAN. Ever seen images of that tree with the wooden fence rails? Tree in the center on display? I suggested doing a semi-circle of split rail fence around this tree, and actually not planting much at all about 10 feet out from the fence. Suggested sasanqua camelia behind each rail. Then a couple or few vine maples to the left side, with sword ferns in various spots. Possible blue fescue. The idea was to present this tree in the same fashion as a giant sequoia in a park, but with a transition zone between it and the garden. The neighbor will probably put a fence to replace the one that the tree heaved, but will not block the trunk. I thought this might be a concept that some of you might like to play around with on your computer programs. The massive tree is a fairly interesting specimen to work with. So I'm putting the before photo in here too, in case any one wants to toy around.
Mario, I like the Sasanqua idea but I dunno about Fescue, perhaps Japanese painted ferns might do well instead? Alternatively Royal fern is a nice foliage contrast and easy to grow as well. :)