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how to stop weeds from growing under deck

Denman & Co.
401 W. Chapman Ave.
Orange, CA 92866
Ball weeder

Any weeds that grow through mulch are easy to pull because the soil remains loose. Photo by Saxon Holt

Frequent, light watering causes shallow roots and helps annual bluegrass, crabgrass, chickweed, sedges and other weed seeds germinate. If you water too little, the lawn suffers while spotted spurge, Bermuda grass, quackgrass and other weeds adapted to drier soil thrive. Instead, provide your lawn with infrequent, deep soakings. Lawns need about 1 inch of water per week. Set an empty tuna can on the lawn to determine when you have applied 1 inch of water.

The frequency and timing of your fertilizing efforts are also crucial to healthy lawns. Both vary depending on your lawn type and the length of your growing season. Most northern lawns need only one or two applications of fertilizer annually—once in fall and sometimes a second time in spring. Southern grasses might require three feedings—early to mid-spring just after the grass greens up, early summer and again in early fall.

Where to Find It

Left unattended, weeds will quickly fill in unplanted areas and any open ground around plants. Mulch spread over the soil surface blocks the sunlight most annual weeds need to take hold. Weeds that do sprout are easy to pull because soil beneath mulch remains loose and moist. Coarse chipped or shredded bark is a good choice for large areas between trees and shrubs because it decomposes slowly and doesn’t easily blow away. For paths, a thick layer of sawdust provides good weed suppression because it depletes nitrogen in the soil.

Irrigation & Green Industry Network
916C N. Formosa Ave.
Los Angeles, CA 90046

Controlling weeds is a fight you can’t win entirely because they always grow back. But you can keep weeds under control by depriving new ones of the conditions they need to take root in the first place. Let’s look at how to prevent weeds from growing.

Deprive Weeds of Water

Preemergence herbicides, such as those containing oryzalin or trifluralin (look on the label for these chemicals), or nontoxic corn gluten meal, kill weeds just as they germinate and will not eradicate established weeds. For a preemergence herbicide to be effective, you must apply it to soil cleared of visible weeds; also, you have to water most of these herbicides into the soil.

Weeds can’t survive without moisture. In areas with little or no summer rain, drip irrigation or soaker hoses help prevent weed seeds from sprouting by depriving them of water. These systems deliver water to the root zone of plants at the soil level. The soil surface and area surrounding the plants stays relatively dry. In contrast, overhead sprinkler systems spray water over the entire soil surface and supply both garden plants and weeds with water.

Another tip for anyone dealing with weeds already growing through decking is to get the decking taken up. It might not be possible and it is a much bigger project, but once the decking is up, you can follow the first steps above and tackle the problem much more efficiently. If this isn’t an option, check out our top 5 tips for effective weed control.

So, how can you avoid getting weeds under your deck and losing your cool in the summer? All you need to do is a bit of planning.

A deck is a great place to relax with family and friends. But weeds coming through your decking will drive you nuts.

Overall, it’s worth remembering that weeds can be maddeningly persistent and even the most thorough planning can sometimes come up short. But the more you do and the more you invest, the better the results will be.

5 tips on how to stop weeds coming through your decking

How to stop weeds from growing under deck

I then cover the weed barrier with sharp sand so there is no room for weeds to grow and take hold underneath the weed barrier.

Here at Wezaggle, we believe you should not be destroying the area with salt or weedkiller, there is a very easy method that will take a few hours to organise and install underneath the decking boards.

You can also use rocks, bricks or anything heavy to keep everything close to the ground. Sand is heavy and offers drainage so you will not get puddles and a lot of runoff when it rains.

If your decking has already been installed then you can still use a weed barrier.

Fitting Your Weed Barrier

The decking installer should have installed a breathable weed barrier straight under the decking.

Weeds can be an issue for garden decking if the installer did not take measures to avoid weeds growing through the decking boards.

Not many people think about weeds when they install their decking only to discover a few months later that green shoots start to pop up.

Installing A Weed Barrier

Every installer should take measures before they lay the decking boards across the joists/frame. There are a few methods you can use to stop weeds from taking hold after your deck has been installed.

Another issue with using plastic sheeting is the rainwater runoff, which can destabilize foundations and other parts of the garden.