Mulch is material that is laid over soil. The benefits of mulch include moisture retention in the soil, temperature control, and inhibited weed growth. Mulch can be made of organic material such as pine needles and sawdust, or it can be made of rubber or minerals.

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The weight of your mulch is dependent upon how much mulch you need and what material the mulch is made of. To determine how much mulch you will need, you must first calculate the square footage of the soon-to-be-mulched area.Measure the length of the area, then measure the width. Multiply the two figures together and now you know the square footage of the area. For circular regions such as the base of a tree, measure the diameter of the area that you wish to mulch. Divide your diameter by 2, then multiply the figure by itself. Take that result and multiply it by 3.14.If the area is in an irregular shape that is not quite a rectangle but not quite a circle, create a rectangle around the area and measure from there. It’s better to overestimate and have excess material than to have too little material to accomplish the job.
The depth of your mulch is dependent on how much coverage you want to accomplish. If applying mulch for aesthetic purposes, you want an even layer. If your flower bed is made up of different plants, you may want to vary the depth around each plant based on that plant’s needs.No plant should have more than 4 inches of mulch on top of its soil. More than 4 inches of mulch will rob the soil below of moisture and oxygen. The result of this deprivation would be the death of your beloved plants. If the area to be mulched contains no plants, feel free to apply as much as you please.Once you’ve decided on the depth of the area, multiply that number by your square footage. Now you’ve determined your cubic feet.Mulch is typically sold in bags measured by cubic feet. This makes it simpler for the consumer to decipher how many bags of mulch they need. If a bag of mulch contains 2 cubic feet of material and you’re trying to fill 12 cubic feet, you’ll need six of these bags.
Now that we’ve determined how many cubic feet of mulch you’ll need, it’s time to go shopping. If you’re worried about the weight of the mulch, there are a few factors that can vary between mulches.A bag of one type of mulch won’t weigh the same as a bag of another type. The materials that the mulch is composed of do not weigh the same. A pound of feathers and a pound of bricks may weigh the same, but a cubic foot of pine bark mulch and a cubic foot of compost mulch won’t be equal on the scale.Wood mulches typically come in 2-cubic-foot bags. These bags can weigh approximately 20 pounds.Straw mulch bags differ. They can be found in bags of 1 cubic foot or 2.5 cubic feet. One 1-cubic-foot bag of straw mulch will weigh around 20 pounds. The 2.5-cubic-foot bags can weigh up to 50 pounds. Compost mulches can weigh around 44 pounds per cubic foot.Inorganic materials for mulch tend to weigh more per cubic foot than their plant-based counterparts.Shredded rubber mulch can weigh 44 pounds per cubic foot. Rocks used for mulch are usually sold in 0.5-cubic-foot bags. One 0.5-cubic-foot bag of river rocks can weigh 50 pounds. This means that every cubic foot weighs in at a whopping 100 pounds. Egg rock is comparable in weight as one 0.5-cubic-foot bag weighs around 45 pounds. Lava rock is the lightest rock option. Its bags only weigh 18 pounds per 0.5 cubic foot.Marble chips are a beautiful way to get the benefits of mulch in your garden without the material decomposing. Marble chips are usually sold in 0.5-cubic-foot bags that weigh 45 pounds each.
Small areas may require as little as 2 cubic feet of mulch. If you’re wondering how much does 2 cubic feet of mulch weigh, the answer is as easy as multiplying the figures above.

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When using wood mulch, 2 cubic feet will weigh approximately 20 pounds. Straw mulch will tip the scale just as much, weighing in at 40 pounds for 2 cubic feet. Compost mulch will total 88 pounds for 2 cubic feet. The same can be said for rubber mulch. River rocks weigh about 200 pounds per 2 cubic feet. Egg rock is a close second, coming in at 180 pounds for 2 cubic feet. Lava rock will weigh only 72 pounds for 2 cubic feet. For 2 cubic feet of marble chips, you’ll find the weight to be 180 pounds.

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