Climber with a conscience

Hedera helix is my name, An ivy which has earned acclaim. I'm hardy English baltica, Will thrive in North America. Dependable and evergreen, I do my job where I'll be seen . . . Will climb brick chimneys, screen a wall, Producing patterns right for all. What's more, as many friends have found, I'm not too proud to hug the ground. I'll cover, where a lawn won't grow, Those spots you'll never need to mow. But I'll confess, if you insist, There is one prank I can't resist. Should I find crack in sash or sill, I'll sneak inside, away from chill. In basement, screened porch, or garage, I'll thank you with a green corsage.