Thuja Green Giant Sunlight Requirements

Leyland Cypress and Thuja Green Giant trees can handle partial shade

. We want to discuss the canopy situation, shade on one side, how being in the North or South can effect a planting site with shade. We also will cover the symptoms of excessive shade, pruning the canopy shade trees and also recommend a good substitute for shady location privacy screens.

A straight overhead canopy of shade is not the best situation for Thuja Green Giant or Leyland Cypress trees. The least desirable situation is an overhead evergreen or pine canopy, since the trees under an evergreen canopy don't even get sunlight during winter. If that is your application, don't plant there! Sometimes it cannot be avoided. For example, in Long Island and in the Hamptons area, some neighborhood have rules about what can be cut and are very strict about cutting native trees to replace with anything not native to the area. Even so, I am not recommending planting Leyland Cypress or Thuja Green Giant trees under a canopy. I have planted these varieties under a canopy that was very high and still it effects the trees.

Northern locations tolerate shade better than southern locations if from decidious trees! If the trees bring the shade are deciduous tress, at least after those canopy trees shed their leaves, the Leyland Cypress trees will get full sun all winter. This is more beneficial from NY and northward than in southern states, because they shed one month earlier in fall than southern trees and also tend not to green up untill four or five weeks later than southern deciduous trees. On Long Island, Thuja Green Giant or Leyland Cypress trees planted under a partial canopy of scrub oaks may get full sun for seven months of winter before leaves re-appear, whereas southern states with a similar situation may only provide five months of full sun. Shade on one side of your row will do no harm, since the Thuja Green Giant row will still get the powerful straight overhead sunlight. Thuja Green Giant or Leyland Cypress trees normally leap three feet per year if fertilized properly, so remember when there are slower growing trees shading on one side, The Thuja Green Giants or Leyland Cypress will "beat out" the shading trees in most cases and eliminate the problem.

The main symptom of too much shade on Leyland Cypress and Thuja Green Gants is thinning. When you first plant them if Ball and Burlap field grown trees, they will be thick at first. Over the years, shady applications will take their toll and they will thin out somewhat. Slow growth is the second symptom. As I stated above, thinning is not caused by shade to one side, lack of straight overhead sunlight is the problem.

Providing light by pruning the offending shade trees is a great idea! If you cut limbs off an evergreen tree that is shading your Leyland Leyland Cypress row, those limbs will not grow back so it should be a one-time effort. If your arborists trim deciduous trees like Poplar, Beech trees, it will likely need trimmed again at a later date. If the limbs on deciduous trees are cut all the way back to the trunk, on the side that shades your Thuja Green Giant trees you may solve it completely. It is always best to do the tree surgery overhead before you plant the privacy hedge beneath. During limbing the arborist can allow the limbs to fall if it is done before planting the Leyland Cypress screen, but if you wait till after planting, the arborist will likely have to rope the branches down to prevent injury to your privacy screen below.

Consider substituting Nellie Stevens Hollies for shady applications. Also remember, when you plant in a mature woodland, the trees nearby not only rob sunlight but will have established root systems that will compete with your new plants for moisture.

by: David Watterson

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