AKA Eastern Hemlock, the Canadian Hemlock grows best in full sun and tolerates partial to full shade. Will tolerate varied soil conditions and pHs, but not overly wet or dry soils.
To promote general health, prune out dead branches. Part of the legume family, it is capable of fixing needed atmospheric nitrogen. Intolerant of drought and should be watered regularly during prolonged dry spells, particularly when plants are young.