Ask a Question forum: Used Preen this Summer - Will I be able to seed in Spring?

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Name: Che Clark
Chicago, IL (western suburbs) (Zone 5b)
checlarkglobal
Sep 18, 2016 8:01 PM CST
Applied Preen per product directions about 1-2 months ago, now I'm realizing that I want to start some flowers by seed and I'm worried that the Preen application might have screwed up those plans.

I know that I can try to germinate the seeds myself, then plant the seedlings. I would really prefer to sow / cast seed in late fall directly on the soil, but I'm concerned that the Preen application this summer will make that direct seeding effort a futile waste of seed that I purchased.

Can anyone tell me how long I can expect Preen to be working before I can expect seed to be able to germinate in the soil? Thank you in advance.
Name: Daisy
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
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DaisyI
Sep 18, 2016 11:31 PM CST
The smaller the seed, the better Preen works. It doesn't work at all on bean seeds but works great on grass seed. And, Preen is advertised to last about 3 months. But Preen only works as seeds germinate, it doesn't keep them from germinating. If your plan is to direct sow this fall and you expect the seeds to germinate next spring, you are safe.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
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sooby
Sep 19, 2016 4:54 AM CST
Which formulation of Preen was it? They make several different products.
Name: Che Clark
Chicago, IL (western suburbs) (Zone 5b)
checlarkglobal
Sep 20, 2016 5:59 AM CST
sooby, I used this:


Thumb of 2016-09-20/checlarkglobal/93078f

Sorry for the sideways pic....
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Image
sooby
Sep 20, 2016 6:39 AM CST
Thanks, so that's the one with trifluralin. It can last longer in cooler weather I believe, but given that you applied it one or two months ago and don't expect germination until spring I would agree with Daisy. I did read somewhere that it can carry over into the next spring for the smaller susceptible seeds but I don't recall when that was actually applied. What you could do to double-check is call the toll-free number on the package and ask the manufacturer.
Name: Che Clark
Chicago, IL (western suburbs) (Zone 5b)
checlarkglobal
Sep 21, 2016 7:45 PM CST
Good idea. I'll give them a call. Thank you all!!
Name: Mary
Lake Stevens, WA (Zone 8a)
Near Seattle
Bookworm Garden Photography Plant and/or Seed Trader Plays in the sandbox Region: Pacific Northwest Seed Starter
Winter Sowing
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Pistil
Sep 21, 2016 7:56 PM CST
I once put out some Preen, then a month or so later wanted to sprout something there. I just put down about an inch of purchased topsoil or potting soil (I can't recall exactly), planted the seeds in that. It worked fine. I figured the Preen would mostly be washing down through the soil, so keeping my seeds up above would work.
Name: Daisy
Reno, Nv (Zone 6b)
Not all who wander are lost
Garden Sages Plant Identifier
Image
DaisyI
Sep 21, 2016 9:37 PM CST
The Preen, mixed with water, forms a layer in the soil that won't allow seeds to grow roots. The seeds germinate but then they die. Digging a hole and replacing the treated soil with untreated soil would work.

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