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prevent weeds from growing back

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.

(For those of you who already have weeds attacking your yard, read our article on How to Get Rid of Weeds.)

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How to Mulch Over Weeds

Too little fertilizer can lead to sparse lawn that loses the competition with weeds. Too much helps nurture certain weeds, notably annual bluegrass, Bermuda grass and crabgrass. Strike a balance by following the application rates on the package. And use a fertilizer with a high percentage of controlled-release nitrogen, such as sulfur-coated urea, ureaform or IBDU. These provide a slow, steady nutrient supply.

In the process of trying to eliminate weeds, people often make mistakes that lead to more weeds. Here are the most common:

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You can also use landscape fabrics to control weeds under decks and in pathways (spread over the excavated soil base before you add gravel or sand). A 3×50-ft. roll of landscape fabric, such as the Typar shown below, costs about $10. The fabric is also available in 36-in. die-cut circles (about $3 each) for installing at the base of trees.

As with most types of prevention, discouraging weed seeds from sprouting requires some extra time now so you can save a lot of time later.

Prevent weeds from growing back

A weed is technically just a plant in the wrong place. It could be an unwanted seedling from another plant, or something more pernicious and invasive that you really want to eradicate. However, while you’ll never be able to completely stop weeds from popping up, there are ways to ensure they have less places to grow.

Most weeds are easy to eradicate if spotted early enough and can be controlled without the use of chemicals.

Bare patches of soil will quickly be colonised by both annual and perennial weeds, so a well-stocked border is less likely to support a thriving population of these pesky plants. If you have gaps in your borders, plug them by planting ground covering plants.

About weeds

Annual weed seeds can survive for years in the soil, waiting for the perfect conditions to grow. They germinate at lower temperatures than most garden plants and can grow and set seed very quickly. It’s important to recognise them at the seedling stage, so you can eliminate them without accidentally removing your flower or vegetable seedlings.

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