Tools and Chemicals

Is ammonium sulfate and 21-0-0 the same thing?

Q: Is ammonium sulfate and 21-0-0 the same thing? A: Sure is! It’s always good to remember in the back of your mind that fertilizers, whether organic or synthetic, are basically chemicals. Organic fertilizers are complex organic compounds; synthetic fertilizers...

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Is Summer Rain Making My Pre-Emergent Less Effective?

Q: My zoysia had quite a crop of crabgrass. I put down a pre-emergent in February but someone said summer rain made the pre-emergent less effective.  A: Your friend might be right but there is another possibility as well. If...

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Bermuda Lawn – I Put A Double Dose Of Pre-Emergent In September

Q: I have a bermuda lawn. I did not put out a pre-emergent in spring, hence I’ve got lots of weeds. I’ve put out a double dose of pre-emergent in September.  A: This is a situation where reading the label...

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Is Ammonium Sulfate the Same As 21-0-0?

Q: Is ammonium sulfate and 21-0-0 the same thing? A: Sure is! It’s always good to remember in the back of your mind that fertilizers, whether organic or synthetic, are basically chemicals. Organic fertilizers are complex organic compounds; synthetic fertilizers...

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Lawnmower Wheel Compaction – Weeds

Q: While walking in my neighborhood, I saw a weird stripe pattern in my neighbor’s lawn. What do you think caused it? A: I posted this on Facebook and received many guesses. The correct answer? The neighbors report that they...

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Does UGA Test Soil For Weed Killer Chemicals?

Q: You recently responded to a question about wilted vegetable leaves that might be caused by weed killer. I had the same symptoms in a new garden bed I planted with top soil from a nursery. Does UGA test soil...

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Crapemyrtle – Will Honeybees Be Affected By Insecticide

Q: Will honeybees be affected if I apply a systemic insecticide to my crapemyrtle to control aphids?  A: Crapemyrtle flowers don’t contain nectar, so the effect on bees is minimal. However, other pollinators visit crapemyrtle flowers to feed on pollen....

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Systemic Insecticide – Effect on Pollinators in Crapemyrtle

Q: Will honeybees be affected if I apply a systemic insecticide to my crapemyrtle to control aphids?  A: Crapemyrtle flowers don’t contain nectar, so the effect on bees is minimal. However, other pollinators visit crapemyrtle flowers to feed on pollen....

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Continuous-Feed Fertilizer – Should I Plan A Fall Feeding

Q: The label on my continuous-feed fertilizer says to feed herbs every three months. I’ve done so once and plan to repeat in July. Should I plan on a fall feeding or not? A: You have good gardening instincts! Despite...

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Lawn Company Sprayed Barricade Pre-Emergent On New Lawn

Q: A lawn maintenance company sprayed Barricade pre-emergent on my new lawn. The grass sod was laid in February. Can I can do anything to minimize the negative impact it will have on my lawn? A: I don’t know exactly...

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Prodiamine And Dimension Products – Will It Affect Zoysia Development

Q: I have a small zoysiagrass bed I use as a source of plugs for replacing my fescue. I want to put out pre-emergent to cut down on goosegrass and crabgrass in the lawn but the label of prodiamine and...

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Lawn Service Sprayed Gardening Area – What To Do

Q: Three weeks ago a lawn service sprayed an area set aside for gardening. The company says to till the area and water, water, water. Any more thoughts? A: Much depends on what was sprayed but in general the advice...

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Lawn Fertilizer – Can I Use It On Trees And Plants

Q: I bought a fertilizer meant for lawns (32-0-8) to use on my bamboo. Can I also use this on trees, camellias, hydrangeas, azaleas and other perennials? A: I think it would be better for the shrubs to use either...

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Vegetable Garden Weed Killer – Leaves Safe Soil For Summer Vegetables

Q: Is there a safe weed killer for vegetable gardens that could be applied now, but still leave the soil safe for this summer’s vegetables? Our garden is loaded with winter weeds. A: Despite social media claims, corn gluten meal...

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Warm Weather – Don`t Put Pre-emergent Down

Q: With the recent warm weather, should I put pre-emergent down? A: I don’t recommend it. It’s actually soil temperatures that determine when summer annual weed seeds germinate. Soil temperatures won’t get high enough to stimulate that until late February...

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Alum – How Much To Use To Acidify Soil

Q: I want to acidify the soil around my azaleas and hydrangeas. How much alum do I use? A: It all depends on what your current pH is and whether your soil is sandy, loamy or clayey. You’ll need more...

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Sprinkler System – Winterizing And How the Drought Effects It

Q: Do I need to winterize my sprinkler system? I’m wondering if the drought would make the ground more apt to let freezing temps get to the system. A: I don’t think the drought will have any effect on your...

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Zoysia Grass – Right Time To Apply Weed Preventer

Q: In late October, I had my backyard sodded with zoysia. It has taken root and seems to be doing well. When is the right time to apply weed preventer? A: In my experience zoysia grass is slow to make...

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