Primesource Meso 4 SC Select Herbicide - Targeted Turf Weed Control

Our review of Primesource Meso 4 SC Select finds it best suited for homeowners and groundskeepers who need a concentrated herbicide that works both pre- and post-emergence to tackle difficult turf weeds. The single biggest reason to buy is its broad control of more than 45 weeds, including tough targets like crabgrass and yellow nutsedge, while allowing application during seeding and overseeding. This makes it a practical choice when renovating lawns or managing established turf where flexibility and potency matter.

Key Features

• Dual pre- and post-emergent control: Allows treatment before seeding and after weeds emerge, so users can manage weeds through renovation and overseeding without switching products.
• Broad weed spectrum: Controls over 45 broadleaf weeds and grasses, including crabgrass, dandelion, ground ivy and yellow foxtail, reducing the need for multiple spot treatments.
• Systemic action: Absorbed through leaves, roots and shoots, giving thorough uptake and improving control of established weeds instead of only surface contact.
• Group 27 mode of action: Inhibits photosynthesis in susceptible plants, which explains the potency and the reports that a small amount is effective.
• Seeding-friendly timing: Can be applied any time you are seeding, including overseeding of established turfgrass, bare ground seeding or during renovation, simplifying scheduling during lawn projects.

Who It's For

Primesource Meso 4 SC Select is aimed at homeowners, landscapers and grounds crews who need a reliable, concentrated herbicide to manage persistent grassy and broadleaf weeds in turf. It fits situations where crabgrass and yellow nutsedge are recurring problems and where the user wants the option to treat before or after seeding without compromising renovation work.

It may be less suitable for casual users who prefer ready-to-use mixes or for people in states where sale is restricted (not for sale to AZ, OR, WA, NM, MT, ID, WY, NV, AK, HI). Users who need a different mode of action or strictly organic options should look elsewhere.

Pros & Cons

Pros

• Effective control of crabgrass and many broadleaf weeds, matching customer reports of strong effectiveness.
• Flexible application timing that works with seeding and overseeding, reducing downtime during lawn renovation.
• Concentrated formula where a small quantity provides coverage, offering good value for money.

Cons

• Not available for sale in several states, limiting access for some buyers.
• Some users report mixed impressions on longevity and total application time, so results may vary with conditions.

Specifications

Product name	Primesource Meso 4 SC Select
Brand	Primesource
Herbicide group	Group 27
Control scope	Pre- and post-emergent control of over 45 weeds
Weeds noted	Crabgrass, dandelion, ground ivy, yellow foxtail, yellow nutsedge
Seeding use	Can be applied during seeding, overseeding, bare ground and renovation
Sales restriction	Not for sale to AZ, OR, WA, NM, MT, ID, WY, NV, AK, HI

Our Verdict

Primesource Meso 4 SC Select is a strong, flexible choice for anyone who needs both pre- and post-emergent turf weed control and expects to seed or renovate lawns. Its systemic Group 27 action and concentration deliver good value for managing stubborn weeds like crabgrass and nutsedge, though buyers must check state availability before purchasing.

Frequently Asked Questions

Can this product be used when seeding a lawn?
Yes. It can be applied anytime you are seeding, including overseeding, bare ground seeding and during renovation as stated in the product description.

Which weeds does it control?
It controls more than 45 broadleaf weeds and grasses, specifically noted are crabgrass, ground ivy, yellow foxtail, yellow nutsedge and dandelion.

Are there any purchase restrictions?
Yes. The product is not for sale to residents of AZ, OR, WA, NM, MT, ID, WY, NV, AK, and HI, so check local availability first.