Views: 1328, Replies: 17 » Jump to the end
Name: Paul
Utah (Zone 5b)
Grandchildren are my greatest joy.
Charter ATP Member Plant Lover: Loves 'em all! Annuals Echinacea Vegetable Grower Hybridizer
Tomato Heads Garden Photography Birds Cut Flowers Foliage Fan Plays in the sandbox
Image
Paul2032
May 16, 2014 8:27 AM CST
I plan on using Preen in some flower beds this year and also mulching with compost. Do I clean-up the bed, put down the Preen, and then the compost or do I put the Preen on top of the mulch? What has been your experience?
Paul Smith Pleasant Grove, Utah
Name: Anne
Summerville, SC (Zone 8a)
Be a voice - not an echo!
Plant and/or Seed Trader Enjoys or suffers cold winters Hybridizer Birds Seed Starter Cat Lover
Pollen collector Morning Glories Greenhouse Bookworm Garden Ideas: Master Level Garden Sages
Image
Xeramtheum
May 16, 2014 8:49 AM CST
I've just started using it and it's amazing .. Preen is the very last thing you want to put on the bed. If you disturb the area, like planting something new, you'll need to reapply more to that area.
"We were all humans until race disconnected us, religion separated us, politics divided us and wealth classified us."

Unknown

Name: Arlene
Southold, Long Island, NY (Zone 7a)
I was one of the first 300 contributors to the plant database! Tomato Heads Houseplants Garden Ideas: Level 1 Photo Contest Winner: 2014 Celebrating Gardening: 2015
Plant Identifier
pirl
May 16, 2014 9:02 AM CST
Preen has to make contact with the soil, then get lightly watered in. It will release a gas that will kill all annual seeds, weeds or not.

I'd clean the bed, dig out any weeds, rake flat, apply Preen, water it in, then add mulch (not compost). It works!
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
Image
greene
May 16, 2014 9:29 AM CST
There is an organic version of Preen; it does need to be applied a little more often but either type of Preen sure saves a lot of work. Thumbs up

When I clean a new area, I apply Preen and water it in, then add the landscape fabric and mulch and apply a bit more Preen and water again. Sure, it's over kill, but it beats missing a spot.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
[Last edited by greene - May 16, 2014 9:30 AM (+)]
Give a thumbs up | Quote | Post #615557 (4)
Name: Elaine
South Sarasota, Florida (Zone 9b)
The one constant in life is change
Cat Lover Master Gardener: Florida Tropicals Multi-Region Gardener Vegetable Grower Region: Florida
Herbs Orchids Birds Garden Ideas: Level 2 Garden Sages Celebrating Gardening: 2015
Image
dyzzypyxxy
May 16, 2014 9:39 AM CST
I've used it on my daughter's garden in Salt Lake for a couple of years. It works both on the soil, and on top of the mulch. Being a pre-emergent herbicide, it prevents seeds from germinating, but will not kill any that have already started. You might be a wee bit late for the first application, Paul, but it sure will help as the weather warms up.

Just spent 2 weeks there, weeding until my back gave out every day . . . Phew! Now she has a huge tree in the back yard producing a billion more seeds. Preen will prevent most of those, hopefully! I can't use it in FL as most of my weeds are perennials, and it will just fertilize them . . Rolling my eyes.
Elaine

"Success is stumbling from failure to failure with no loss of enthusiasm." –Winston Churchill
Name: Anne
Summerville, SC (Zone 8a)
Be a voice - not an echo!
Plant and/or Seed Trader Enjoys or suffers cold winters Hybridizer Birds Seed Starter Cat Lover
Pollen collector Morning Glories Greenhouse Bookworm Garden Ideas: Master Level Garden Sages
Image
Xeramtheum
May 16, 2014 10:18 AM CST
Hmmm .. I read that Preen works by smothering seeds with corn glutenate .. have not read anything about a gas or it having to be in contact with soil.
"We were all humans until race disconnected us, religion separated us, politics divided us and wealth classified us."

Unknown

Name: Jennifer
48036 MI (Zone 6b)
Cottage Gardener Houseplants Spiders! Heucheras Frogs and Toads Dahlias
Hummingbirder Sedums Winter Sowing Peonies Region: Michigan Garden Ideas: Level 2
Image
jvdubb
May 16, 2014 10:24 AM CST
Preen will also keep perennials seeds from germinating.
Name: Anne
Summerville, SC (Zone 8a)
Be a voice - not an echo!
Plant and/or Seed Trader Enjoys or suffers cold winters Hybridizer Birds Seed Starter Cat Lover
Pollen collector Morning Glories Greenhouse Bookworm Garden Ideas: Master Level Garden Sages
Image
Xeramtheum
May 16, 2014 11:46 AM CST
Yeah .. you definitely don't want to use it around your Salvia or Monarda.

I put it on my front bed by the road before I planted my main plants .. I covered the perennials coming up with buckets then sprayed weed killer on the bed .. a few days later I hoed everything under then applied the Preen. Usually when I weed my beds I see new weeds coming up from seed within a day or two afterwards .. so far, and it's been about 4 days, I haven't see any new weeds coming up in the bed. I check it every day.

I'm considering doing half my round bed with Preen and the other half without just as a test.
"We were all humans until race disconnected us, religion separated us, politics divided us and wealth classified us."

Unknown

Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
Image
greene
May 16, 2014 3:31 PM CST
There are some seeds which are immune to the Preen. One that I know from experience is Oenothera. I cleared an entire area of all vegetation, using the scuffle hoe to cut everything and went back to re-work the soil in case I missed anything. I spread Preen generously and watered it in. The only seeds which germinated all on their own were from the Oenothera which I had allowed to re-seed (on purpose to check if what I had read online was true).

I'm still testing, but I believe that White Sweet Clover /Melilotus officinalis is also immune to Preen; I would imagine that the Yellow Sweet Clover would react the same way if I could ever find seeds for that one.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
Name: Anne
Summerville, SC (Zone 8a)
Be a voice - not an echo!
Plant and/or Seed Trader Enjoys or suffers cold winters Hybridizer Birds Seed Starter Cat Lover
Pollen collector Morning Glories Greenhouse Bookworm Garden Ideas: Master Level Garden Sages
Image
Xeramtheum
May 16, 2014 3:33 PM CST
I wonder if the seed shape or type of seed coat is what makes it immune.
"We were all humans until race disconnected us, religion separated us, politics divided us and wealth classified us."

Unknown

Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
Image
greene
May 16, 2014 3:49 PM CST
Still researching (to hopefully save money) but for now I am reading that if I were to obtain corn which has been milled into corn meal and nothing has been removed from it - so 'whole grain', so to speak - it would act as a fungicide as well as a pre-emergent.

Oh, would that save a bunch of money! (Don't tell the people at Preen about this.)
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
Name: Arlene
Southold, Long Island, NY (Zone 7a)
I was one of the first 300 contributors to the plant database! Tomato Heads Houseplants Garden Ideas: Level 1 Photo Contest Winner: 2014 Celebrating Gardening: 2015
Plant Identifier
pirl
May 16, 2014 6:14 PM CST
Greene - http://www.amazon.com/s/?ie=UTF8&keywords=corn+gluten+meal+f...

FREE shipping on many of them!

I'd like to try it, too, and saw Espoma also carries it.
Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
Charter ATP Member I was one of the first 300 contributors to the plant database! Plant Database Moderator Plant Identifier Region: Nebraska Forum moderator
Garden Sages Garden Ideas: Master Level Irises Celebrating Gardening: 2015
Image
KentPfeiffer
May 16, 2014 7:01 PM CST

Plants Admin

One note, Preen neither kills seeds nor prevents them from germinating. What it does is inhibit root elongation in most plants that come in contact with it. "Adult" plants can tolerate that (to varying degrees, if I remember right the directions recommend not using it around certain plants), but it is usually a fatal circumstance when a seed germinates and can't elongate its root.
[Last edited by KentPfeiffer - May 16, 2014 7:03 PM (+)]
Give a thumbs up | Quote | Post #616029 (13)
Name: Anne
Summerville, SC (Zone 8a)
Be a voice - not an echo!
Plant and/or Seed Trader Enjoys or suffers cold winters Hybridizer Birds Seed Starter Cat Lover
Pollen collector Morning Glories Greenhouse Bookworm Garden Ideas: Master Level Garden Sages
Image
Xeramtheum
May 16, 2014 7:16 PM CST
Wow .. so much conflicting information on how it works.
"We were all humans until race disconnected us, religion separated us, politics divided us and wealth classified us."

Unknown

Name: Paul
Utah (Zone 5b)
Grandchildren are my greatest joy.
Charter ATP Member Plant Lover: Loves 'em all! Annuals Echinacea Vegetable Grower Hybridizer
Tomato Heads Garden Photography Birds Cut Flowers Foliage Fan Plays in the sandbox
Image
Paul2032
May 16, 2014 7:31 PM CST
I have several Iris friends here that have used it for year with their iris and other flowers and they swear by it.
Paul Smith Pleasant Grove, Utah
Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
Charter ATP Member I was one of the first 300 contributors to the plant database! Plant Database Moderator Plant Identifier Region: Nebraska Forum moderator
Garden Sages Garden Ideas: Master Level Irises Celebrating Gardening: 2015
Image
KentPfeiffer
May 16, 2014 7:31 PM CST

Plants Admin

Xeramtheum said:Wow .. so much conflicting information on how it works.


That's because it's widely used, but the mechanism for how it works isn't exactly a marketing department's dream come true. 'Preen inhibits root elongation!' doesn't sell. But, 'Preen prevents weeds!' does and it's accurate, or at least accurate enough. Smiling
[Last edited by KentPfeiffer - May 16, 2014 7:33 PM (+)]
Give a thumbs up | Quote | Post #616046 (16)
Name: Anne
Summerville, SC (Zone 8a)
Be a voice - not an echo!
Plant and/or Seed Trader Enjoys or suffers cold winters Hybridizer Birds Seed Starter Cat Lover
Pollen collector Morning Glories Greenhouse Bookworm Garden Ideas: Master Level Garden Sages
Image
Xeramtheum
May 16, 2014 8:38 PM CST
Ok .. Preen is mostly the herbicide Trifluralin. Below is an excerpt of an article, Practical Applications of Herbicide Physiology. Here is the link to it: http://passel.unl.edu/pages/informationmodule.php?idinformat...

Trifluralin is a seedling growth inhibiting herbicide that is absorbed efficiently by the roots and shoots of germinating seedlings but is very immobile in the plant and soil. Trifluralin inhibits cell division in root and shoot meristems. Trifluralin is registered for control of unemerged weeds in corn when applied after the corn has developed two leaves. By the two leaf stage the shoots of corn and weeds have a well developed outer layer that prevents aborption of any trifluralin that may contact the shoot. Since trifluralin is very immobile in the soil it does not move deeply enough into the soil to come in contact with the immature (meristematic) portions of the root system of established corn or weeds. Emerged corn and weeds are not harmed from this type of trifluralin application because the tissue effective in absorbing trifluralin is not exposed to the herbicide. In contrast the shoots of germinating weed seedlings absorb trifluralin from the surface soil and are controlled.

What Kent said is correct. In reading further I'm seeing conflicting information about how long it persists in the soil. I need to look into that further.
"We were all humans until race disconnected us, religion separated us, politics divided us and wealth classified us."

Unknown

Name: woofie
NE WA (Zone 5a)
Charter ATP Member Garden Procrastinator Greenhouse Dragonflies Plays in the sandbox I was one of the first 300 contributors to the plant database!
The WITWIT Badge I helped plan and beta test the plant database. Dog Lover Enjoys or suffers cold winters Container Gardener Seed Starter
Image
woofie
May 17, 2014 4:25 PM CST
On the Preen website, they don't recommend using it around Clematis. They have a list of plants it's compatible with here:
http://www.preen.com/products/preen-garden-weed-preventer/pl...
I think the list is different for the "organic" version, tho, which is supposed to be ok to use around vegetables.
Confidence is that feeling you have right before you do something really stupid.

« Garden.org Homepage
« Back to the top
« Forums List
« Ask a Question forum
You must first create a username and login before you can reply to this thread.

Today's site banner is by sunnyvalley and is called "Hair-raising"