Iris, how could you tell that's H. helix and not another weakly
/sporadically lobed species e.g. H. algeriensis Hibberd?

Hedera helix is the species most likely to be grown as an outdoor ground cover
in the temperate US. Hedera algeriensis & H. canariensis are not that hardy.
Also, it looks more like the typical outdoor H. helix. Not that it matters. The
instructions for growing it indoors are essentially the same.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)