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weeds growing in new sod

Make sure the weed killer you pick is labeled for use on the turf species in your lawn. Consider a selective post-emergent herbicide in a spray bottle or tank sprayer with a controllable stream; this way, you can easily spot-treat the weeds in your new sod.

Sod is a transplanted mature turf that is grown on a farm and then rolled out like a rug on your property. Sod provides an easy option for instantly cultivating a lush, green yard. But to ensure the health and longevity of the grass, sod needs time to take root after being laid in your lawn.

Fresh sod needs time for its roots to anchor into the soil and spread out and grow. Sod is vulnerable when you first roll it out and thus must be protected damage due to mishaps. Before applying herbicides to sod, then, give it at least three weeks to establish itself in your lawn. If possible, pull up weeds manually rather than using herbicides during this critical period of growth. However be careful not to walk on newly planted sod if to wet, it could disturb your final grade.

Premium, high-quality sod is typically weed-free when you receive it. However, weeds may appear when you lay new sod over soil that already contains live weeds. If weeds appear in your new sod, you need to exercise caution before using herbicides to control them.

Timing is Important

Pre-emergent herbicides prevent weeds from growing, but if you lay sod in spring or fall it may be too late to use this kind of herbicide. You could use it the next year if needed, but once your sod is down, focus on post-emergent herbicides instead. Just take care to focus on the isolated weeds to avoid causing collateral damage to the surrounding turf.

What Kind of Weed Killer Should I Use?

Weeds growing in new sod

Sod is similar to carpet. You roll it out, stagger the seams and make sure it looks right before setting it into its permanent place. Unlike carpet, however, sod is living and it takes time for the tender roots of the turf species to anchor themselves into the soil so they can spread out and grow. During this time, your sod is vulnerable and one mishap could damage it — permanently. You shouldn’t have any issues with weeds when the sod is young, but there is always a chance of a troublesome plant species popping up. You can apply most herbicides labeled for use on your turf-grass species once your sod has established itself.

There are two basic types of weed killer available to homeowners: pre- and post-emergent herbicides. Pre-emergent herbicides, true to their name, prevent weeds from emerging. However, you lay sod in either spring or fall, depending on whether it’s a warm- or cool-season grass and miss the mark as far as timing for pre-emergent herbicide. Some pre-emergent herbicides can also keep your sod from rooting well. Keep them in mind for next year, however, if you notice weeds come up in your sod.

Sod Installation

During the first few weeks, particularly the first two weeks, chemicals and your sod won’t mix. After the first couple of weeks, however, take care of weeds with your chosen weed killer. Post-emergent herbicides in a ready-to-spray bottle with a controllable stream are ideal for spot-treating those pesky weeds that pop up in your new sod. Make sure the weed killer is labeled for use on your sod and will destroy your target weeds, then spray the emerged weeds.

Stay Away From Pre-emergents

Looking out your window at the freshly laid sod covering your yard can be a rewarding experience. Seeing a few weeds pop up in your brand new lawn is less than rewarding, however, and can be downright frustrating. You can apply proper weed killers to sod; you just need to wait a bit before doing so.

I’m in Toronto, and the Forsythia bloom has literally just begun today (there are some bushes in my neighbor’s yard that were pretty bare yesterday, and have bloomed yellow today) so these weeds in my lawn just sprung up out of nowhere.

1. Does anyone know what kind of weeds these are? And if a Pre-Em would even work at this point? (or should I just yank them out manually)

I’m planning on applying a big bag of CGM, to act as a mild fertilizer and pseudo-PreEM (since I already have the bag, I might as well use it). I was maybe thinking about calling a lawn guy to apply something, but I don’t want just some random pre-Em if it won’t work on this type of stubborn looking weed (looks like barngrass, crabgrass, or one of those other types that have a firm and purple-ish stem).

I just laid out Kentucky Bluegrass sometime in November, and I am kind of surprised to see that (after barely its first season) my grass is already pretty yellowish, and I have this strange set of weeds forming so quickly into the new season.