I think that is a good question, why spray or put down a pre m with winter coming, why not just get them when you put your crab grass preventer down first thing in the spring

 

You'll find that this is a great time of year to kill weeds. Since weeds will carry any weed killer you spray on them this time of year throughout their root systems (called translocation), your chances for success are great.

You're right on with your math too. Since the blend of fertilizer you're asking about is comprised of 29% nitrogen, you would be applying 1 lb. of N per M thousand sq. ft.) if you applied that blend of fert at a rate of 3.45 lbs., per M. The math looks like this... .29 N (same as 29% N) x 3.45 lbs per M of product applied = 1 lb of N you'd be appling per M. See what I mean? :waving:

 

Thanks Vic

One pound of N is the recommended rate for a fall feeding?

Also I just took a reading of the soil. 3' inches down its bewteen 58-60 degrees. At what temp will grass/weeds stop growing?

 

Ditto --- nice advice Vic. I remember spraying weeds in the mornings with frost on them....guess what -- the weeds were dead in the spring.

Also nice advice regarding the N factor.:usflag:

You'll find that this is a great time of year to kill weeds. Since weeds will carry any weed killer you spray on them this time of year throughout their root systems (called translocation), your chances for success are great.

You're right on with your math too. Since the blend of fertilizer you're asking about is comprised of 29% nitrogen, you would be applying 1 lb. of N per M thousand sq. ft.) if you applied that blend of fert at a rate of 3.45 lbs., per M. The math looks like this... .29 N (same as 29% N) x 3.45 lbs per M of product applied = 1 lb of N you'd be appling per M. See what I mean? :waving:

 

Grass stops growing when temperatures stay below 45. Depending on the type of seed--could be lower or higher. Except that warm season grasses are completely different.

Weeds--also depends on the species. Spurge needs hot weather. Chickweed, veronica, henbit (as winter annuals) prefer cold weather. Weed control for dandelions should work fine. Wild garlic, too.

 

cool season perinnials can be sprayed now because they are growing. including Henbit, chickweed and dandelion.

 

fall46, Good question, I've had that on my mind lately too.

 

You won't see the violent twisting and curling like you do in the spring, but guess what? You won't see them in the spring period! They're younger and more succulent now vs. in the spring when they're hardier, deeper roots, etc... And, they are sending energy towards the roots for winter, and when you apply herbicide, that goes into the root system as well. Often times in the spring when everyone goes crazy with weed control all they're doing is burning the tops off because the roots are so developed. A couple weeks later they wonder why they have more weeds, when in reality, they're the same weeds, which have shot up new top growth. Fall weed control is the whip.

 

cool season perinnials can be sprayed now because they are growing. including Henbit, chickweed and dandelion.

What are cool season perinnals?

Henbit and Chickweed are winter annuals. I am assuming that is what you meant? You are correct that Dandelion is a perinnial.

Just some slight details but wanted to clairfy and ask.

 

The best time to spray is now.

 

Great feedback everyone! One last question is their any harm in spraying for weeds using the Weed B gone and the applying the 29-0-4 right after? Do I need to wait?

 

Do it at the same time.

 

Well, I don't know what 'Weed B Gone' IS- other than just a RETAIL product. Is it in an amine (water based) or an ester (alcohol based) formulation? I'm guessing amine.

From my many years of lawn-jockeying, if anything needed to be touched up THIS late, it is usually in lawns where other summer annuals (crab,spurge,purslane) have faded away, and the customers were not willing to renovate, or worse, were never asked. Or on newly seeded lawns, too, sometimes.
I'd always had my best luck in mid-late fall with what I'd started with using in the mid spring- an ESTER formulation of weed control, with spreader-sticker added, of course. Ester stinks to high heaven, often have a milky emulsification, and are a little more pricey (but not so bad if you really FOLLOW the label) Examples are 'Cool Power', Lesco's 'Three Way Ester II', and 'Quicksilver'. But, for best results, always use Quicksilver as a tank-mix product with sometime else, like Trimec or Three-Way.

The reason for using an ester (alcohol) formulation is that it BREAKS THROUGH the cuticle of the leaf surface so well, compared to a water-based solution. And this is needed when it's cool, because the vascular system is SLOWING DOWN so much within the plant then.
But be sure to label those bottles you buy 'FOR COOL WEATHER ONLY' if you don't use it all up, because if you were to use 'Three Way Ester II' at regular strength on an 85 degree day in June, you'd probably be BUYING that yard!

 

Fall is an excellent time for broadleaf weed control.(actually the best time)

Timed properly you can catch the newly sprouted winter annuals as well.

This will make your spring alot more pleasant.