Canadian hemlock

Canadian hemlock (Tsuga canadensis 'Lewis') should be watered well and deeply (at least 1 inch of water per week) throughout the growing season. Watering should be done either by hand with a watering can or with a low-pressure sprinkler. Weekly during the spring and summer, and bi-weekly during the fall and winter, is an acceptable watering schedule. It is important to water early in the morning, to allow the foliage to dry until midday. During hot summer days, extra water may be needed to prevent wilting. Be sure not to overwater, as this can lead to root rot.

Canadian hemlock (Tsuga canadensis 'Lewis') prefers partial shade or dappled sun and can tolerate full sun for a few hours a day; however, it will usually flourish in environments that receive only 2 to 4 hours of direct sunlight per day. The tree can also tolerate windy conditions and light shade. To ensure optimal growth and a thick, lush foliage, the tree should be given 8 to 10 hours of sunlight each day. If the tree is planted in a sunnier area, some shade should be provided during the hottest afternoon hours, when the sun is at its highest intensity. Care should also be taken to ensure that the tree does not receive too much shade, as this can result in weak growth or leggy branches.

Canadian hemlock (Tsuga canadensis 'Lewis') should be pruned in early spring or late winter when the plant is dormant. Pruning should be light, focusing on removal of dead, broken, or diseased wood. Shaping of the plant with selective pruning should occur only when necessary and should be done with care to retain the natural growth habit of the plant. Any large branch being removed should be done so in stages over multiple pruning sessions.