posted 9 months ago
I wondered if you were on the east side and it was in the form of snow, or at least winter (non-growing period). In order for you to get fast, plentiful growth on about anything, you are going to need to irrigate it from the time that snow melt moisture becomes 'minimal' to at least until trees that have determinate growth stop growing for the year, and then maintain soil moisture at a level for good bud development for growth the following year. If you are near a stream/creek, Populus trichocarpa (Black Cottonwood) May be in order, but its mature size is quite a bit bigger than a mature apple tree. On the other hand, It can be maintained in a shrublike status for a very long time with frequent clipping (ok, I'm thinking of 'browsing' as clipping) I did my MS thesis on browse utilization and measurement and utilized cottonwood shrubs that were along side cottonwood trees that were 2.5 feet in diameter. This might not be the tree you want, but it does grow fast and can be shaped, in droughty areas, but requires well drained soil (almost sand) and requires lots of water.
There are likely other trees. All are going to require irrigation. There are others that I'm sure won't get this big at maturity. Not sure about growth rate as the cottonwood could put on 2 feet or more per year. (w/ right conditions)