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Preen Southern Weed Preventer Plus Plant Food

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Preen Southern Weed Preventer Plus Plant Food is specially formulated for the long, hot growing season of the typical southern climate.  One application prevents weeds for 4 months while feeding plants for beautiful color, foliage, and strong root growth.

This product can be used anytime during the spring, summer or fall in flower and ornamental garden beds and around ground covers, trees and shrubs. Although this product will not kill existing weeds, it will prevent new weeds from sprouting — eliminating the need for difficult and time-consuming hand weeding. There is no chance of overfeeding or burning your plants when used as directed. 

Without weeds, your valuable plants can grow larger and stronger. Your beds will stay neat and weed-free all season long!

Where to buy · View product label (PDF)

Application

How to Apply

When plants are dry, sprinkle Preen Southern Weed Preventer Plus Plant Food on soil surface and immediately water in to activate. It forms a weed control barrier in the top layer of soil, preventing weed seeds from germinating. Disturbance to the soil surface after activation may result in erratic weed control.

When to Apply

Apply Preen Southern Weed Preventer Plus Plant Food anytime in the spring, summer or fall around established plants and transplants. It should not be used on flower seeds. In can be used after flowering plants have germinated and are 2 to 3 inches tall. Since it does not kill existing weeds, you must first remove any that have already begun to grow.

Rain does not wash this product out of the soil. For optimum weed control and plant feeding, reapply this product every 4 months.

Applying Around Established and Transplanted Plants

For flowers, roses, herbs, ground covers, ornamental grasses, shrubs, and  trees, sprinkle Preen Southern Weed Preventer Plus Plant Food evenly over the entire soil surface. Immediately water this product into soil surface. If watering-in is not convenient, lightly rake into soil surface. Always wash or brush off stray granules from plant foliage.

Applying with Mulch

For best weed control, we recommend applying Preen Southern Weed Preventer Plus Plant Food after spreading mulch on your flower and shrub beds. Sprinkle it on top of mulch. Immediately water this product into the mulch. If watering-in is not convenient, lightly rake into top layer of mulch. Always wash or brush off stray granules from plant foliage.

This is not the product label. Always read and follow directions on the product label. Use only as directed.

FAQ

Coupons

Do you offer coupons, rebates, etc?

We, as the manufacturer of Preen, do not offer any coupons or rebates. However, very often our retailers or mass merchants offer their own special sale price, coupons or rebates. Local flyers, newspaper inserts and media advertising can alert you to these offers.

General Product Questions

How does Preen® Southern Weed Preventer Plus Plant Food work?

Preen® Southern Weed Preventer Plus Plant Food creates a barrier that inhibits weed seed growth. The barrier lasts up to 16 weeks. Preen Southern Weed Preventer Plus Plant Food is specially formulated to be effective throughout the longer growing season typical of southern climates.

How long does Preen® Southern Weed Preventer Plus Plant Food stay in the soil?

Approximately 12 to 16 weeks per application. The rate at which Preen Southern Weed Preventer Plus Plant Food biodegrades will depend on temperature, soil type, rain/moisture, sunlight and amount applied.

I have Preen® Garden Weed Preventer Plus Plant Food and Preen® Southern Weed Preventer Plus Plant Food. Are these products the same?

Each product contains a different weed-preventing ingredient. Please refer to your plant label for the active ingredient percentage and fertilizer/plant food analysis information. Preen Southern Weed Preventer Plus Plant Food is specially formulated for the longer growing seasons and hot temperatures generally found in southern climates.

What are the other ingredients in Preen® Southern Weed Preventer Plus Plant Food?

Preen® Southern Weed Preventer Plus Plant Food also contains a carrier agent such as corn cob or attaclay, as well as fertilizer.

What are the particles on the soil surface after I watered Preen® Southern Weed Preventer Plus Plant Food?

They are a carrier agent, such as corncob, and will biodegrade over time.

What does “established plant” mean on the Preen® Southern Weed Preventer Plus Plant Food label?

The term “established plant” refers to flowers, trees and shrubs at least 3″ in height, not recently transplanted and having a strong root system. An established groundcover is one not recently planted and that has spread or filled in to your satisfaction.

What does “food producing trees and ornamentals” mean?

The term “food producing trees and ornamentals” refers to plants that produce fruit, nuts, syrup and other food products, including vegetables and herbs. Preen Southern Weed Preventer Plus Plant Food cannot be applied to these plants.

What is the active ingredient in Preen® Southern Weed Preventer Plus Plant Food?

0.19% Dithiopry.

What weed seeds does Preen® Southern Weed Preventer Plus Plant Food prevent from germinating?

See our list of weeds controlled or the product label.

What weeds does Preen® Southern Weed Preventer Plus Plant Food kill?

None; Preen® Southern Weed Preventer Plus Plant Food helps to prevent its label listed weed seeds from germinating up to 12 weeks per application. It does not kill or inhibit existing weeds in any way.

When can people and pets enter an area that was treated with Preen® Southern Weed Preventer Plus Plant Food?

They may enter the treated area after it is thoroughly dry from the first rain and/or watering.

Why is the Preen® Southern Weed Preventer Plus Plant Food container not full?

Preen® Southern Weed Preventer Plus Plant Food is packaged/sold by weight not by volume; if you weigh the container you will find that the weight is as stated or slightly higher.

Will rain wash Preen® Southern Weed Preventer Plus Plant Food away?

No, but heavy rain may shorten its effective period.

Do you have a guarantee on your products?

Preen® Guarantee: To the extent consistent with applicable law, Lebanon Seaboard Corporation guarantees you will be satisfied with the performance of Preen® products when used as directed, or your money back. If not satisfied, describe the nature of your problem, and send with proof of purchase to:

Lebanon Seaboard Corporation
1600 East Cumberland St.
Lebanon, PA 17042

Proper Use

Can I mix Preen® Southern Weed Preventer Plus Plant Food with water before application?

No. Mixing with water dilutes the active ingredient and renders Preen® Southern Weed Preventer Plus Plant Food ineffective.

Can I walk on a Preen® Southern Weed Preventer Plus Plant Food treated area?

Avoid walking on a treated area; any disturbance will result in erratic weed prevention.

Can Preen® Southern Weed Preventer Plus Plant Food be applied on plant foliage or plant roots?

No. Plant injury could result.

Can Preen® Southern Weed Preventer Plus Plant Food be applied when plant foliage is wet?

No. Plant injury could result.

Can Preen® Southern Weed Preventer Plus Plant Food Plus Plant Food be applied when the garden soil is wet?

No. Uneven coverage and erratic label listed weed seed prevention could result.

Do I apply Preen® Southern Weed Preventer Plus Plant Food by hand?

No. Apply with either the refillable shaker canister, the scoop included in some Preen® Southern Weed Preventer Plus Plant Food packaging, your garden scoop, or a make shift applicator.

Do I have to weed first before applying Preen® Southern Weed Preventer Plus Plant Food?

Yes. Preen® Southern Weed Preventer Plus Plant Food does not kill existing weeds, so you must hand-pull existing weeds first. Note that Preen® Southern Weed Preventer Plus Plant Food will not control weeds that are tilled under.

Does Preen® Southern Weed Preventer Plus Plant Food control weeds that are tilled under?

No. Weeds that are not completely removed will emerge again.

Does Preen® Southern Weed Preventer Plus Plant Food need to be watered-in?

Yes. Rain or water must immediately follow application to activate Preen® Southern Weed Preventer Plus Plant Food.

How close can I apply Preen® Southern Weed Preventer Plus Plant Food to a non-recommended plant?

Apply Preen® Southern Weed Preventer Plus Plant Food at least 12 inches outside the drip-line from a non-recommended plant. [NOTE: Consumer assumes liability for any plant damage resulting from the use of Preen® around plant species not recommended on the label.]

How do you use Preen® Southern Weed Preventer Plus Plant Food with flowers, shrubs, and trees?

Ensure the flowers, shrubs and trees are listed on the label. Remove existing weeds and weed roots. Then, apply Preen® Southern Weed Preventer Plus Plant Food and water thoroughly.

How do you use Preen® Southern Weed Preventer Plus Plant Food with groundcovers?

Ensure your groundcovers are fully established, have spread to your satisfaction and are listed on the label. Remove existing weeds and weed roots. Then, apply Preen® Southern Weed Preventer Plus Plant Food around the dry foliage. Water thoroughly.

How long does Preen® Southern Weed Preventer Plus Plant Food prevent weed seeds from germinating?

Up to 16 weeks per application. Reapplication may be necessary sooner if heavy rain occurs.

How much Preen® Southern Weed Preventer Plus Plant Food should I apply?

For label-recommended established flowers, shrubs, trees, and groundcovers, apply at a rate of 9.6 ounces per 100 square feet. Do not apply more than 6.0 lb. of this product per 1,000 sq. ft. per application and no more than 18.0 lb. of this product/1000 sq. ft. per year (equivalent to 0.5 and 1.5 lb. of active ingredient per acre, respectively). The maximum number of applications per treatment site is 3 per year.

What happens if rain or water does not immediately occur after application?

Preen® Southern Weed Preventer Plus Plant Food will not start to work until rain or watering occurs. If watering is not an option, time your application with rain. Lightly rake Preen® Southern Weed Preventer Plus Plant Food into the soil surface to protect it from sunlight until rain occurs.

When do I apply Preen® Southern Weed Preventer Plus Plant Food with bulbs?

Apply on dry, weed-free garden soil when any of the label-recommended bulb plants are at least 3″ tall. Water immediately after application.

When do I apply Preen® Southern Weed Preventer Plus Plant Food?

Anytime during the growing season when the ground temperature is at least 50–55 degrees.

When do I reapply Preen® Southern Weed Preventer Plus Plant Food?

Reapply every 12 – 16 weeks in the growing season. Do not apply more than 3 times a year

Storage & Safety

Can Preen® Southern Weed Preventer Plus Plant Food be stored for next year?

Yes. Store in a dry place away from sunlight and moisture, atop a piece of cardboard or an old newspaper.

Does Preen® Southern Weed Preventer Plus Plant Food expire?

No. Preen® Southern Weed Preventer Plus Plant Food has an indefinite shelf-life as long as it's sheltered from moisture and sunlight.

How do I dispose of Preen® Southern Weed Preventer Plus Plant Food or its empty container?

Call your local municipality to inquire on proper product disposal and/or package recycling, or call 1-800-CLEANUP. If not recyclable and container is empty, place empty container in trash.

Preen® Southern Weed Preventer Plus Plant Food was over-applied in my garden. How can I save my plants from injury?

If rain or watering did not occur: Physically remove Preen® Southern Weed Preventer Plus Plant Food.

If rain or watering did occur, or if you were unable to physically remove Preen® Southern Weed Preventer Plus Plant Food, neutralize it by following these steps.

The active ingredient should be neutralized using activated charcoal granules. Activated charcoal can be found at garden centers, pool supply stores, pet stores, or in the aquarium supply section of stores. Call the store first to confirm availability. Charcoal bricks used in a grill will not work.

  1. Sprinkle activated charcoal granules onto the soil surface at a rate of one pound per 100 square feet.
  2. Gently rake the activated charcoal into surface of soil.
  3. Thoroughly water the activated charcoal treated area.
  4. Repeat the watering schedule for three days.
  5. Cease watering and wait two days. After two days, the active ingredient in the product will be neutralized.
Preen® Southern Weed Preventer Plus Plant Food was over-applied in my garden. Is there any risk?

Yes. Injury may occur to plants.

What can I do if I applied Preen® Southern Weed Preventer Plus Plant Food to my lawn, grass or flower seeds, a non-recommended plant, etc.?

The active ingredient should be neutralized using activated charcoal granules. Activated charcoal can be found at garden centers, pool supply stores, pet stores, or in the aquarium supply section of stores. Call the store first to confirm availability. Charcoal bricks used in a grill will not work.

  1. Sprinkle activated charcoal granules onto the soil surface at a rate of one pound per 100 square feet.
  2. Gently rake the activated charcoal into surface of soil.
  3. Thoroughly water the activated charcoal treated area.
  4. Repeat the watering schedule for 3 days.
  5. Cease watering and wait 2 days. After 2 days, the active ingredient in the product will be neutralized.
What do I do if Preen® Southern Weed Preventer Plus Plant Food accidentally got on plant foliage during application?

Before watering, gently and immediately dry-brush Preen® Southern Weed Preventer Plus Plant Food off plant foliage.

Where can I find emergency medical information for Preen® Southern Weed Preventer Plus Plant Food?

Immediately call Prosar Corporation toll-free at (888) 208-1368 and/or 911.

Use with Seeds and Young Plants

How long after an application of Preen® Southern Weed Preventer Plus Plant Food should I wait before planting new seed or transplanting?

Wait 16 weeks from when Preen® Southern Weed Preventer Plus Plant Food was applied.

Will flower seeds germinate with Preen® Southern Weed Preventer Plus Plant Food?

Flower seeds will not germinate or reseed while Preen® Southern Weed Preventer Plus Plant Food is active (about 16 weeks per application).

Use Around Vegetables

How do I apply Preen® Southern Weed Preventer Plus Plant Food with vegetables?

Preen Southern Weed Preventer Plus Plant Food cannot be used in vegetable gardens.

Use with Mulch

Can I apply Preen® Southern Weed Preventer Plus Plant Food before mulching?

Yes, after removing existing weeds and weed roots. Then, apply Preen® Southern Weed Preventer Plus Plant Food and water thoroughly.

Can Preen® Southern Weed Preventer Plus Plant Food be applied on top of mulch?

Yes. After removing existing weeds and weed roots, rake the mulch to loosen it, and ensure the mulch is 2–3″ thick. Then, apply Preen® Southern Weed Preventer Plus Plant Food and water thoroughly.

Where to Apply Preen

Can I apply Preen Southern Weed Preventer Plus Plant Food between bricks or patio blocks, on pebbles or on other hard surfaces?

Yes

Can I use Preen® Southern Weed Preventer Plus Plant Food around, under, or near a swimming pool, sandbox, playground type areas, or under bird feeders?

No.

Can I use Preen® Southern Weed Preventer Plus Plant Food in or near a greenhouse or any type of enclosed area?

No. Volitization could occur causing plant injury.

Can I use Preen® Southern Weed Preventer Plus Plant Food in or near a pond, lake, or other type of waterway?

No. Preen® Southern Weed Preventer Plus Plant Food is harmful to aquatic life.

Can I use Preen® Southern Weed Preventer Plus Plant Food on a garden slope or hillside?

Yes, if a waterway is not at the bottom of the slope or hillside.

Can I use Preen® Southern Weed Preventer Plus Plant Food on my lawn or with grass seed or sod?

No. Turf injury could result. Preen® Southern Weed Preventer Plus Plant Food is not labeled for use on lawns.

Can I use Preen® Southern Weed Preventer Plus Plant Food where chickens, horses or other animals graze?

No.

Can I use Preen® Southern Weed Preventer Plus Plant Food with an ornamental plant that is not listed in the recommended established plant section?

Yes, but use caution. Make a trial application of Preen Southern Weed Preventer Plus Plant Food at the recommended rate around one or two plants. Observe the plants for 30 to 60 days. If plant injury results, do not use Preen around other plants of the same species. [NOTE: Consumer assumes liability for any plant damage resulting from the use of Preen around plant species not recommended on the label.]

Can Preen® Southern Weed Preventer Plus Plant Food be applied around corn?

No. Preen® Southern Weed Preventer Plus Plant Food is not labeled for use on corn.

Can Preen® Southern Weed Preventer Plus Plant Food be applied to strawberries?

No. Preen® Southern Weed Preventer Plus Plant Food is not labeled for use on strawberries.

Can Preen® Southern Weed Preventer Plus Plant Food be used in potted plants or planter boxes?

No. Plant injury could result.

What plants are recommended with Preen® Southern Weed Preventer Plus Plant Food?

See our plant compatibility tool or the product label.

Where to Buy Preen

Can I order Preen® Southern Weed Preventer Plus Plant Food on your website?

No, but the product is available at most home and garden centers. Use our store locator to find a retailer near you.

Is Preen® Southern Weed Preventer Plus Plant Food available outside of the United States?

No. Preen® Southern Weed Preventer Plus Plant Food is not available or registered outside of the United States.

Available Sizes

Product Support

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