i have no idea about whether the tree is appropriate for the location size wise..

but i doubt the building of the patio will have any impact on such a young tree ...

the tree will put its roots where it needs its roots ...

it would be a bigger issue if you had a mature tree.. and bulldozed the yard to make the patio ...

and a few stones on top of it all isnt going to make any type of problems ... its like perfect drainage ... allows air in.. didnt disturb the roots ... i see no downside ...

besides.. whats done is done.. QUIT WORRYING ABOUT IT ...

good luck

ken

ps: zone 5.. these are last years pix.. yes?? ... if it leafs out in a few weeks.. you are all set .... if they are this years pix.. and they are already leafed out.. you are not z5 ....

Thanks Ken. LOL... Yes, those are last year's pics. The tree currently is just starting to bud.

First, that's a nicely done hardscape near the house.

If that is K. japonicum, the plant is big for the spot, as their spread is greater than the distance to the houses; you'll want to ensure you begin training and structural pruning soon to ensure you don't get too much conflict with shade/moisture on shingles and the two-story next door. Nonetheless, it's a wonderful tree IMHO and you might find in 15-20 years the roots are displacing the hardscape. Any damage to the roots from construction would be slight and don't fret about it.

Dan

Thanks Dan. I'm certain the roots were not disturbed with the patio construction as they had not gone out that far yet. I'm more wondering about the roots as the tree grows and what will happen when they reach the brick. I've heard that certain trees have such strong roots that they can push over anything in their path, although I'm not sure if the Katsura is like that.

But yes, the tree is absolutely wonderful IMO. In fact, its the best looking tree I've ever had.