Mid Atlantic Gardening forum: Questions re planned lawn renovation

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Sep 6, 2018 1:16 PM CST
Am planning to renovate areas of my lawn soon and have some questions before I do a fall reseeding

I have some spots of crabgrass and would like to know if it is necessary to kill them with a crabgrass herbicide before I plant grass seed in several bare areas. I have hand pulled them whenever I notice new growth to prevent them from going to seed. As crabgrass is an annual will a crabgrass killer be necessary? Iwas thinking of using a pre emergent treatment in the spring.

I have been plagued with areas of nut sedge which I understand is a perennial. Should I use something like sedge hammer to kill this annoying grass before I re-seed?
In the spring I had a problem with hairy bitter cress and yarrow which i hand pulled. Will the crabgrass pre emergent spring treatment help to prevent these weeds next year?

Thanks for your help
Name: Ric Sanders
Dover, Pa. (Zone 6b)
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Sep 12, 2018 10:04 AM CST
idreos, crabgrass can usually be controlled with a pre emergent. Perennials like nut sedge require treatment with Roundup for lawns or such, which will take care of others as well. Just check the directions for time till you reseed. Then use a pre emergent in the spring. There are organic recommendations but take longer with less finite results. Smiling
Ric of MAF @ DG
Name: Sally
central Maryland
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Sep 20, 2018 5:59 AM CST
Yarrow is perennial, and I do not think it seeds much. If you pulled, I think you got it.
Bittercress I beleive is a winter weed that will germinate too early for control by the same pre emergent that you typically time in March-ish - April for crabgrass.
This might hep
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Name: Critter (Jill)
Frederick, MD (Zone 6b)
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Oct 4, 2018 10:16 AM CST
My dad said he's recently had good results treating with pre-emergent (he likes Scotts "Halt") in fall rather than in early spring -- gets any earlier stuff and still gets the crabgrass.
I'm learning to dance in the rain. Thank you, Sally & Chris & Sharon.

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