Answer: Monrovia sells an oak with the dimensions you describe. It's called a Columnar English Oak (Quercus robur 'Fastigiata'). If this is your tree, it has narrow, upright branches as a young tree, a broader pyramidal form with age. Dark green leaves hold color into fall before dropping. It grows in full sunshine and should be watered deeply when the top 2-3" of soil dries out.
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