There are many types of mulch. And it's important to choose the right type for your plants or tree. Here is an overview of the different types of materials (both organic and inorganic) used in mulching. 

Black Polyethylene Plastic

This can prevent the growth of weeds and can hold water in the soil. But this is not recommended if your area is not well drained.

Cocoa Bean Hulls

The brown colour of cocoa shells are attractive, and they have nice chocolate scent. This type of material is easy to apply and fairly stable. Just be careful if you have pet dogs because the hulls may contain residual theobromine that could poison them.

Grass Clippings

These are a quick source of nitrogen. But they can create a thick mat which water cannot penetrate. They decompose fast and generate a great deal of damaging heat, making them a short-lived type of mulch. Also, they can be harmful to plants, especially when you use grass clippings from lawns treated with herbicides.

Gravel, Crushed Stone, and Pebbles

These are permanent and can provide good weed control. These materials can reflect solar radiation, resulting in a very hot environment in summer.

Newspaper

This can effectively keep weeds down. It keeps them from blowing away and therefore multiplying. Do not use newspaper with with colour dyes that can be harmful to the soil.

Shredded Bark from redwood or cedar trees

Shredded bark from cedar or redwood could be available from tree trimming companies. If they are freshly shredded, they tie up soil nitrogen as they break down, making it not available to your tree or  plants, so you would want to add some compost on the soil prior to adding the shredded bark.

Tree leaves

These are best used when composted or shredded. They are easy to get and attractive as a mulch. After tree leaves decompose, it's best to dig them into the soil and add a fresh top layer of mulch.

Wood Chips

These contain tree bark and pieces of wood of different sizes. They make provide good weed control and provide good weed control. However, they can attract termites and other insects. Make sure you get wood chips from healthy trees to avoid disease or pest.

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