Rock beds are low-maintenance — though never no-maintenance — when done right, and doing it right involves placing a barrier between the rocks and your soil. The barrier of choice is usually heavy-duty landscape fabric, but tarps or other types of plastic can sometimes be an acceptable substitute.
What About Cost? Rock is more expensive than bark mulch. The price of rock mulch varies, depending on the type and size, but generally costs two to three times more than an application of mulch. But remember, it doesn’t break down and disappear into the soil like bark mulch does.
Best Weed Barrier Under Rocks
Choose landscape fabric or black plastic as the underlayments. Because water passes through the landscape fabric under your rocks, holes in it need to be only large enough to fit around the bushes’ trunks.
For most purposes, 2 inches (or 50mm) of landscaping rock is adequate. If you use a material that is larger than this, then the depth will be the same size as the rocks themselves. That is, you will want one layer of 3 to 8 inches (75 to 200mm) of rocks.
The plastic is only recommended for small areas of rock, not for mulched beds, graded slopes or hillsides. If you have Oaks be wary of placing rocks beneath the trees as Oak leaves do not break down quickly and you will have to blow or vacuum the leaves from the rocks to keep them looking neat.
Even though it doesn’t break down like landscape fabric, plastic isn’t a permanent fix to your garden; you must replace it periodically to keep your garden weed-free. Landscape plastic traps heat, which can smother your plants in the summer.
If you do not need to lay the rocks immediately, and the weather is warm and sunny, put plastic over the area and leave it for around six weeks or more. This process will kill the weeds under the plastic. … Once you are ready to lay your landscaping rocks, you have a few options to put down under them to prevent weeds.
Landscape plastic tends to be less permeable than landscape fabrics, preventing the loss of moisture and exchange of gasses with the environment. In an annual vegetable or flower garden, this is often an admirable trait — plastic mulches smother weeds and warm the soil much faster than landscape fabric.
Ensure that your gardening area is completely weed-free. Pull up all existing weeds before doing anything. You must work all compost and additives into the garden soil by turning it. Since the fabric will be covering the soil and you cannot work on it once it has been laid.
Gravel (and other rocks) act as barriers that shun rain and other forms of precipitation away from a building’s foundation. … This helps to melt ice more quickly and move water away from a home’s foundation in a much faster way. Be sure to only use rocks for drainage if your soil slopes away from your home’s foundation.
Like organic mulch, a 2-3” layer of stone is required to prevent weeds. Stone eventually works its way into landscape soil and is very difficult to remove when a landscape remodel is in order. Dust and dirt also settle between rocks that ultimately allow weed seeds to germinate.
Decide on the appropriate depth for your mulch; both rock and organic mulches should be 2 to 4 inches deep for the best moisture retention and weed control.
Length in feet x Width in feet x Depth in feet (inches divided by 12). Take the total and divide by 21.6 (the amount of cubic feet in a ton). The final figure will be the estimated amount of tons required.
I’ve used both newspaper and cardboard in place of landscape fabric. … Don’t forget to use several sheets of newspaper and overlap your sheets well. Weeds grow up through the cracks if you don’t do that. You will be quite pleased with your results!
Biodegradable Weed Barrier Alternatives
Layers of cardboard or newspaper are a hybrid between biodegradable mulches and weed fabric. They form a weed barrier that lasts anywhere from a couple months to over a year, but they’re generally less effective than weed fabric at smothering tough perennial weeds.
As well as blocking weeds from growing, placing the right stones on top of soil will also help water drainage. … By adding porous rocks on top of your soil, they will absorb a lot of the rain water. This gives the soil the opportunity to benefit from a respectable amount of water instead of way too much.
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