We're still working on a memorial garden in the backyard at my Charlie Girl's gravesite. Charlie was the world's best dog that we lost last summer to cancer. We're kinda waiting for spring to do the plantings. It will be mainly wildflowers, a memorial stone and a forsythia bush that DH just can't kill, no matter how hard he tries. I want to plant a smallish tree in the center of her garden. It can't have an extremely long and evasive root system because the septic tank is also in the backyard. It will have to compete somewhat for sunlight with the old hickory trees to the east of it. This can be a blessing for a young tree during the brutal summers. I really want a flowering japanese cherry, but not sure they grow here. My other choice would be a dogwood. Any other trees I should consider?