“If your havin weed problems I feel bad for you son! I got 99 problems but a weed ain’t one.” – Anonymous
This time of year can be very frustrating for Arizona Landscaping. In most parts of the state our weather is just warm enough to allow weeds to take over our yards. In a matter of a week we can find half the yard covered with weeds and the yearly battle to control them begins.
There are two basic groups of weeds, those that are grasses and those that are broadleaf and they can be classified as annuals or perennials. Annual weeds grow from seeds. They grow, flower and produce more seeds and die within one season. Perennial weeds can live for several years. The control methods you choose will depend on what type of weed you are dealing with.
Weed Control
Depending on the size of the “weed outbreak” you can choose to either manually remove the weeds or apply applications of herbicides. Should you choose to manually remove the weeds (recommended for smaller jobs), you can accomplish this with sharp hoes, shovels, or hand pulling. If applications of herbicides are to be used, it is important to select one that will target the weed you are dealing with and not harm any surrounding vegetation.
In gravel areas both annual and perennial weeds can be controlled with the application of a post-emergent herbicide. Post-emergent meaning weeds that have already sprouted and are growing. The most common products for this application contain Glyphosate or Glufosinate as active ingredients listed on the label. These herbicides work by translocating the product through the leaves to the roots where they interfere with the growth process. Both these products are non-selective, meaning they will kill any growing vegetation, both grass and broadleaf.
In lawn areas the best weed control is a healthy lawn. Turf will out-compete most weeds and regular mowing will remove the growing tips of the weeds. Any chemical weed control should be practiced only on well established lawns as newly installed or seeded lawns are often injured by weed control agents. Spot treatment with Glyphosate is effective especially in dormant winter Bermuda lawns.
Pre-emergents work very well in preventing weed seeds from sprouting and work best in gravel areas. Do not use a pre-emergent if you plan to establish a Bermuda grass lawn by seeding. The same is true in the fall if you overseed your hybrid Bermuda or Bermuda grass lawn – it will prevent the winter rye grass seeds from sprouting! Many pre-emergents are available from your local nursery or home improvement store. Ask the sales staff for assistance if you are unsure which product is a pre-emergent. Apply twice a year in April for summer weeds and September for control of winter weeds.
Caution: Never use a total vegetation killer that is a soil sterilant. These products kill existing vegetation, persist in the soil for many years and can leach into surrounding areas seriously affecting or killing plants there. If you have an area in your yard where nothing will grow, a soil sterilant like Triox may have been applied there in the past.
Be careful when using products that contain 2-4-D. They are designed to be applied when the temperatures are cool. During most of the year this product volatilizes (turns to a gas) and can cause damage to surrounding vegetation as it drifts through the air.
Remember! Always follow label directions! The average homeowner applies 9 times more chemicals to their property than a farmer does on the same size land. This can be deadly – to plants, pets and humans. The key is to get the weeds under control now and the rest of the year will be cake.












