Mulch

There are a number of advantages to mulching the soil after planting your tree or shrub. For best results, it is important to choose good-quality mulch and to follow a few simple rules.

Why mulch?

• it conserves soil moisture ;
• it controls weeds and other competing vegetation, including grass ;
• it buffers soil temperature extremes ;
• it adds nutrients and organic matter as it decomposes (if you use organic mulch) ;
• it prevents erosion and prevents a crust from forming on the soil surface ;
• it protects the roots when there is not enough snow cover ;
• it improves the appearance of planting sites ;
• it protects the trunk from lawnmower and edge trimmer damage ;
• it provides shelter for helpful insects ;
• it can improve root volume by up to 400%!

Choosing mulch

• It is best to use well broken-down organic mulch (shredded bark, wood chips, buckwheat hulls, etc.).
• Avoid using decorative stones and geotextile cloth and membranes, which interfere with gas exchanges between the soil and air.
• Make sure that the mulch doesn’t contain any toxins and has a suitable pH.
• Don’t use materials that are too light; they could be blown off.

Applying mulch:

• Apply a layer of mulch 8 to 15 cm thick before it settles. If you are using hardwood bark, 5 cm is enough.
• Be careful not to stir the mulch into the soil.
• To prevent decay, keep the mulch 10 to 15 cm away from the collar on the trunk.
• Water the mulch to keep it in place.