I'd say my 6" caliper Celebration Maples were about 10' wide. So I'd say that 25-30' crown estimate is a 30 year width. The grow about 18" in height a year though.

There may be rules for your municipality but generally speaking I plant trees that width about 7' off the lotline. 3' for mowing and 4' for mulch. I also consider the placement. Is it just grassy area that the neighbor doesn't utilize or an area where kids are active playing football? The latter may prompt me to go further off the lotline. If the former I think you can go 7' off the lotline. Depending on your Arb you might need more than 12' from centerline of each plant.

Celebration grows fast, but it grows tall, not plump. I planted a 12' one right next to the property line 8 years ago (asked the owners if it was OK). It grows like mad, but is just finally started to grow outward just a little. The trunk is still pretty skinny. I'm not impressed by this tree to be honest. The fall color is yellow, and it's sometimes a water diva (one year it dropped all its leaves when we didn't get enough rain). It really doesn't block or shade much.

Sheet on web site of introducer shows a tree that will reach way over onto your neighbor's side in time.

Note that commercial sources routinely understate growth potential of large shade tree selections. Parents of cross have both been known to produce specimens well more than 60' tall in multiple locations. In fact, 179' tall by 120' wide was claimed for a red maple in MI during 1984, with a 125' by 134' silver maple reported from the same state in 1979. Even if these individuals were over-assessed by some yards or more you are still talking about BIG trees.

Here is a link that might be useful: CELEBRATION®

Celebration gets 20-25' wide, not sure how it would reach way over in the neighbors property if its planted 12' off the lot line?

milton, if you didn't buy or plant these trees yet my thoughts are inline with mehearty. The fall color is subpar. I had two of them and just didn't like them.

Cultivar clearly is not atypically upright- and narrow-growing despite being so described. See photos at my link to the introducer's "sell sheet" (above), where multiple individuals with nearly level lower branching and broad crown shapes are shown, and the pictures in the Images portion of the document linked to below.

Here is a link that might be useful: United States Patent: PP07279

Does it matter what the photos "appear" to show? Read the text about the size of the parent.

I had two that were 10 years old with 6" caliper trunk. They were 10' wide before I sold the house. The first 5 years is where you see the strongest growth. They were very upright with many of the main scaffold branches aschending at 30 degrees.

I'm going to go with my actual growing experience.

I take that back, they were about 45 degrees.

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