No Rest For The Wicked

The wicked plants in your garden are not necessarily turf weeds but exotic invasive trees, ornamentals, and vines that take over ecosystems and spread their havoc far and wide. The Florida Exotic Pest Plant Council, known as FLEPPC, has a downloadable brochure for your files, maintenance company crew, or your HOA to determine if a plant species should be removed. If a HOA committee is renovating common areas or older landscapes, make sure that these plants are not in the design.

Many of these beautiful and hardy plants were sold and encouraged in previous years so its not anyone's fault that they are in your yard.  But while Category 1 Exotics are not illegal to sell nor mandatory to remove, they are still expanding into Florida's habitats and will for decades to come. Exotic invasives are dangerous because they are easily propagated by seeds and spread by underground roots. Birds and winds from tropical storms help dispurse the seeds increasing their range out of neighborhoods and across the state. As these "Most Unwanted" plants multiply, they compete with native plants for space and resources.

 

In your landscape, exotic invasives grow very quickly and have little to no pest problems to help decrease their numbers. Exotics, then with water and fertlizer that in their homeland countries would not normally get so their species has no natural controls, and populations explode.

Who are these most wanted wicked plant species? Are they in your backyard? Here are some of the ones I frequently see:

• Coral ardesia, Ardesia crenata
• Asparagus fern, Asparagus aethiopicus (formerly Asparagus sprengerii)
• Orchid tree, Bauhinia variegata
• Camphor tree, Cinnamomum camphora
• Wild taro, Colocasia esculenta
• Heavenly bamboo, Nandina domestica
• Sword fern, Nephrolepis cordifolia
• Mexican petunia, Ruellia tweediana
• Mother-in-law tongues, Sanseveria hyacinthoides
• Chinese tallow tree Sapium sebiferum
• Brazilian pepper, Schinus terebinthifolius
• Arrowhead vine Syngonium podophyllum

Weeds, Weeds, Weeds

Warmer temperatures in spring brings the bad with the good.  While it's great to have the sunny skies, to be out in the garden, it also brings weeds to your turf and garden beds.  If you don't get a handle on the weeds now, you'll be pulling not only weeds all summer long but your hair out in frustration. 

What's the secret behind having a luscious lawn with no weeds?  Good balance!  The proper sunlight, right amount of water, and correct fertilization that all work to make your lawn healthy and weed free. 

Whether its' St. Augustinegrass, bahiagrass, or zoysiagrass, you need to make sure that best management practices guide your lawn maintenance.  Do you or your lawn maintenance company use the following pracctices:

• Keep all lawn equipment clean and sterile?  Do you blow your lawn mower off after each lawncutting before going on to another yard or being stored?
• Keep your lawn mower blades sharp?  Blades need to be sharpened after every five mowings.
• Bag your clippings if you have a weed problem?  If not, you may be mulching the weed seeds right back into your lawn.
• Keep your mower at its highest level?  Keeping your turf as high as possible will make it healthier and more likely to keep weed seeds out of yard.  No scalping!  St. Augustinegrass and Bahiagrass need to be mowed at 3" to 4" and Zoysiagrass should be around 2.5".
• Watering only when necessary - not just because it's your day to water.  St. Augustinegrass and Zoysiagrass need about 1.5" of water a week, Bahiagrass needs about 1".  Watering more than your turf needs will result in short root systems that will not survive droughts and allow for turf to be more susceptible to weeds and diseases.  An easy way to tell if your turfgrass needs watered?  Walk across your turf.  After 2-3 minutes turn around and see if you can see your footprints where you walked. If you can, you need to water.  If the grass has sprung right back up again, no need to water, there is enough hydration in your grassblades. Other indications that your lawn needs watered:  grass blades that fold or turn greenish-blue.
• Fertilize twice a year with low (0-2%) phosophorus fertilizer and an 1:1 ratio of nitrogen and potassium. 

Control of weeds can be easier if you apply pre-emergent herbicides in the early spring and herbicides in springtime and fall.  Do not apply herbicides in the summertime when the temperatures are over 85 degrees. If you only have a few weeds, then spot-treat. There is no reason to apply an herbicide to your whole lawn. If you have more than 75% of your lawn is weedy, then it might make more sense and dollar-wise to get rid of the entire lawn and replace.  Check your options. 

There are three types of weeds and identification of the weed is your best bet to getting rid of it.  Broadleaf, grasses, and sedges.  and there are different herbicides to get remove them. Make sure you read the label before you purchase so that you understand what the herbicide will kill and how to apply it.  Make sure your turfgrass is listed and the weed is listed on the label.

UF/IFAS has an excellent publication on Weed Management in a Florida Lawn. 

Herbicide-Resistant Weeds Defy Being Rounded Up

The argument continues for environmentalists and anti-GM (genetically modified) protesters against chemical use in agriculture. David Mercer, AP is reporting on Breitbart:

The weed killer, known generically as glyphosate, is absorbed through plants' leaves and kills them by blocking the production of proteins they need to grow. At the same time, the U.S. Environmental Protection Agency considers it to have little toxicity to people and animals, and aside from the plants it's sprayed on, it's less of a threat to the environment because it quickly binds to soil and becomes inactive.

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With increased reliance on Roundup, herbicide use on corn decreased from 2.76 pounds an acre in 1994 to 2.06 in 2005, the most recent year for which the U.S. Department of Agriculture has data. Spread that out over the 81.8 million acres planted in 2005, and it's a decrease of more than 57 million pounds of herbicides annually.

Farmers also found they could cut back or in some cases eliminate tilling, reducing erosion and fuel use.

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But with any herbicide, the more it's used, the more likely it'll run into individual plants within a species that have just enough genetic variation to survive what kills most of their relatives. With each generation, the survivors represent a larger percentage of the species.

St. Louis-based Monsanto maintains the resistance is often overstated, noting that most weeds show no sign of immunity.

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In Australia, weed scientist Stephen Powles has been a sort of evangelist for saving Roundup, calling it a near-miraculous farming tool.

Australia has been dealing with Roundup-resistant weeds since the mid 1990s, but changes in farming practices have helped keep it effective, Powers said. That has included using a broader array of herbicides to kill off Roundup resistant weeds and employing other methods of weed control.

As with most agricultural practices, specific herbicides are not silver bullets, especially when abused. Multiple, holistic approaches are needed for management. Overuse of any chemical, fertilizer, ingredient that is humanly applied will lead to Mother Nature arguing defensively on what actually should happen to her planet. We ultimately learn our lessons the hard way and the answer is usually a Goldilocks strategy, Not too much, not too little but just right.