Canadian Hemlock are the best choice if in the 6th or lower area for a privacy screen in shady places. Belonging to the genus Tsuga, the Canadian hemlock is also known as Tsuga canadensis. They grow less than two feet a year, to be large evergreen trees, and can be pruned smaller and denser. They do not grow fast in the shade. More information on the best areas of resistance, soil types, pruning, irrigation, growth rates, spacing and a parasite that is a problem.
Canadian Hemlock grows best in areas 3 through 7, according to all the websites I’ve found. According to my observations, they actually do better in zones 3 to 6. In North Carolina, for example, I only see them grow naturally in the mountains, where zone 6a is. My advice if you are in zone 6b or higher and you have a shaded position to screen, consider Nellie Stevens Hollies instead.
Types of terrain
These trees do not like dry or compacted soils at all. They need acid soils that drain well. If the screen position is high and dry, you need to add a ring of mulch to the root area of the tree and consider installing a drip irrigation system to keep the tree at its best. However, do not deposit the mulch or dirt after planting it against the trunk. Planting Canadian hemlock in sandy, clayey and calcareous soil with a pH between 5.0 and 6.0 is ideal for how it best fits moderately acid soils – weakly acidic soil. Canadian Hemlock must have a soil rich in organic matter – such as compost or peat moss – that can retain moisture. If you plant in clay soils, add organic substances and the plant will be fine. Sandy soil conditions, such as those at Cape Cod with organic matter and regularly watered to have a beautiful plant. Hemlocks prefer acid soil, so be sure to run soil samples before adding lime near the plants!
The twenty-five foot distance would allow you to grow them without pruning or covering. A distance of ten or fourteen feet is good for the Canadian Hemlock privacy screens, if you’re going to prune them and even get past them before they reach 4 times the distance you’ve spaced from each other. The zig zag pattern allows you to plant the distant one but get the closure in & frac12; time as a single line. If you plant two parallel rows with the zigzag pattern, space them fourteen feet in the middle along each row but stagger and a tree will appear every seven feet. Once each tree reaches seven feet wide, you will have the beginning of your visual screen.
To manage height, complete pruning by April before new growth begins. In this way the new growth will fill the spaces you will open during pruning and the new growth that will develop will keep the plant soft, even if you have cut the plant like a wall. Irrigation Their root system should remain moist, but not wet, with frequent watering. All the tree roots need to suck or breathe, so water every other day, not every day.
Parasites – Hemlock Wooly Adelgid.
The Canadian hemlock is often not bothered by pests or diseases, there is a parasite that annoys them, but it is easily manageable. The small insect similar to an aphid called woolen hemlock is the one that is hidden inside a woolly bag. Regular surveys of your hemlock will help prevent serious damage from this pest, provided you check them at least once a year. The insect resembles small pieces of cotton and develops on the underside of the needles. October is the best time to treat these parasites, using both insecticide soap and horticulture oil. You can use a product called “Bayer Advanced 12 Month Tree and Shrub Protect and Feed II Granules”. Use applying annually close to the base of the tree. This will control the insects throughout the year. It has a systemic action; Simply pour on the ground at the base of the tree and it will move upward through the root system up to the top of the tree without spraying. This product is available everywhere. The active substance is imidacloprid. Always follow the label’s instructions, the label might say “not for sale in New York”.