A friend of mine is offering me to remove from his
garden a few rhizomes with their culms.

The species appear to Phyllostachis aureosulcata.

The culms are fairly "large" about 20 ft / 6 m high
and 1 inch / 2.5 cm in diameter, possibly a little more.

Of course for practical reasons I will have to trim these
culms somewhat before transplantation

Assuming that everything is OK (soil, sun, moisture,
mulch etc.) what size culms can I expect from these
rhizomes nest year?

We live in Southern New York State (Putnam Cty,
Lower Hudson Valley)

Under the best possible conditions locally this species
appears to reach 40 ft / 2 inch.