What's your favorite Crabgrass timeline description?

larjoranjFebruary 8, 2008

A check this morning of online pre-emergent advice from universities, blogs, lawn care sites and fertilizer companies turned up more than 20 different ways to describe when to apply (I quit counting when I ran out of toes). I saw: Multiple dates in each month from January thru May; Soil temps from 52 - 60 for 3 consecutive days up to 10 consecutive days;When Forsythia blooms, when Forsythia blooms begin to wilt, when Forsythia blooms fall off;When dandelions appear, but before they turn to puffballs; When Eastern Redbuds first bloom and when they are in full bloom; Same for dogwoods; When Azaleas bloom; And info as precise as .... a few weeks before the crabgrass starts to grow. That one was especially helpful.

Which do each of you prefer?

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gryd(Trumbull, CT Z6)

I guess it all depends on where you are. In southern CT, I have been successful with late April applications. It happens to usually coincide with the Forsythia blooming. If it's a week or two early it shouldn't matter. Most pre-M's last a long time (3-4 months).

    Bookmark   February 8, 2008 at 4:15PM
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firstandgoal

From trial and error over several years, I have pinpointed to put mine down around Feb 1st here in Central Oklahoma. I also see alot of dormant Bermuda lawns "painted" green with a preemergent this time of year.

The temps fluctuate alot this time of year, and on the South side of my house I can see a few shoots of Bermuda about a half inch long emerging.

My advice, if you grow Bermuda turf, put preemergent down when it's still dormant in late winter.

    Bookmark   February 13, 2008 at 12:52AM
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jimtnc(7b Raleigh tttf)

I'm in NC, and some of those indicators you mentioned are good (when Forsythia blooms), but if you have an unusually warm winter (which we have had for 2-3 years) you're screwed if you wait until the right indicator is triggered, because all the grass weeds are growing then too.

I put out my prevent-everything-from-germinating pre-m and a fertilizer app also right now (mid Feb), then again around mid to late Apr/May 1. That usually will keep most everything including all the grass weeds from germinating, unless they already germinated over fall to winter. That usually stops everything you don't want growing dead in it's tracks.

    Bookmark   February 13, 2008 at 6:03AM
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dchall_san_antonio(8 San Antonio)

We don't have forsythia so I use the blooms on the tree at the church a couple streets over. So for San Antonians, that tree bloomed last week.

    Bookmark   February 15, 2008 at 12:43AM
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theyardbird(z7 OK, TTTF)

Wow, firstandgoal, I didn't think we had to put it on so early here. I was planning on applying some this weekend (so of course, there's a chance of snow). I hope I haven't waited too late. Last year, I waited until the first weekend of March, which was definitely too late.

    Bookmark   February 15, 2008 at 8:52AM
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lutzd79

My understanding is that crabgrass will start to germinate when ground temps are consistently in the 50's, so I use this map and zoom in on my area, when the ground temps get to 50 degrees for a few days, I put my down.

http://www.greencastonline.com/SoilTempMaps.aspx

    Bookmark   February 15, 2008 at 10:01AM
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quirkyquercus

When the cows come home?

When hell freezes over?

When pigs fly?

Those would be my favorite crabgrass timeline descriptions.

    Bookmark   February 15, 2008 at 10:47AM
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jvmagic(USDA9)

hi,
i'm in northern california (San Jose; 95118). when would I need to use pre-emergent?

thanks,

    Bookmark   February 15, 2008 at 1:41PM
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zhotster

lutzd79, great link, thanks for posting it. I'll give this a try, it makes a LOT of sense.

One thing I did notice when I changed the region to "Great Lakes" it put the timeframe back to Sept 07. I'm hoping they update the region maps, as the zooming in helps.

    Bookmark   February 15, 2008 at 6:36PM
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lutzd79

zhotster,

I went on the website to check out the "great lakes" issue you mentioned. All I do is use the national-today map and just point my mouse on my area and click, each time I click it zooms in closer. It remains on todays data. Try that out and see it meets your needs a little better. Thanks.

    Bookmark   February 15, 2008 at 10:39PM
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rcnaylor(z7 Tex)

Thanks for a good link.

You might also check around for a local soil temp link. One of our tv weather stations runs one at the two inch and six inch depth updated daily on their web site.

    Bookmark   February 16, 2008 at 6:29AM
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zhotster

lutzd79, that did the trick! It opened a new window with exactly the same national map, but clicking on that map gave me my local temperatures.

Thanks much!

As far as rcnaylor's suggestion, I did some searching but couldn't find anything local for me. I did find a lot of folks refernce/refer the site that lutzd79 uses.

    Bookmark   February 16, 2008 at 6:40AM
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dchall_san_antonio(8 San Antonio)

That link is the coolest thing I've seen in a long time. Thanks. I'm making it a hot link for those who didn't want to copy and paste.

With reference to the thread at hand, if you are in or below the bright green band on the map, you need to be thinking about crabgrass sprouting.

Here is a link that might be useful: National Map of Soil Temperature

    Bookmark   February 16, 2008 at 4:26PM
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enigma7(6)

So I'm right outside of Philadelphia PA and currently showing in the blue-green aqua color. I was thinking about applying this weekend (not just for crabgrass but broadleaf weed as well). Do you think I should wait longer or pull the trigger?

Our forsythia has large buds but has not yet popped (I'd give it 2 weeks max, probably closer to a week).

    Bookmark   March 14, 2008 at 4:40PM
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