Ortho Weed B Gon Plus Crabgrass Control Concentrate (32 oz) Review (2026)
By The DIYPicks Team · Updated July 2026
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- Lawn weeds
- Crabgrass
- Dandelions
- Selective control
The lawn-specific weed killer: a 2,4-D/MCPA/dicamba concentrate that kills crabgrass, dandelions and 200+ broadleaf weeds to the root while sparing listed turf grasses. As a concentrate it's cheap to cover a whole lawn and rainproof in about an hour. Because it's a real herbicide, follow the label exactly, wear PPE, keep it off garden beds and calm-day spray only, since drift harms other plants.
Pros
- Kills broadleaf weeds and crabgrass down to the root while leaving listed lawn grasses unharmed
- Concentrate is far cheaper per square foot than ready-to-use bottles for treating a whole lawn
- Rainproof in about an hour and works with one application on many weeds
Cons
- Contains 2,4-D and dicamba, which are toxic to nearby garden plants and drift on wind, so it demands PPE and calm, careful spraying strictly per the label
- Not selective in flower or vegetable beds; it will damage anything that isn't listed lawn grass
- Can injure the lawn itself if over-applied, or used on the wrong grass type or in high heat
Specifications
| Type | Selective post-emergent for lawns (spares listed turf grasses) |
|---|---|
| Active ingredients | 2,4-D 8.658%, MCPA 2.127%, Dicamba 0.371% |
| Kills | 200+ listed weeds incl. crabgrass, dandelion and clover |
| Rainproof | About 1 hour |
| Application | Mix per label (e.g. ~2 fl oz per gal for northern lawns), ~500 sq ft per gal |