Ortho Weed B Gon Plus Crabgrass Control Concentrate (32 oz) Review (2026)
By Nate Sawyer, Editor · Updated July 2026
DIYPicks is reader-supported. As an Amazon Associate and affiliate of home-improvement retailers, we may earn a commission when you buy through links on our site — at no extra cost to you. This never affects our recommendations.
- 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 |
Frequently Asked Questions
- Will Weed B Gon kill my lawn?
- Not if it is one of the listed turf grasses and you follow the rate — it is selective and spares those while killing 200+ broadleaf weeds and crabgrass. It can injure the lawn if over-applied or used on an unlisted grass type, so identify your turf first.
- Can you use it in flower or vegetable beds?
- No. It is not selective outside lawn grass and will damage ornamentals and vegetables. Beds need spot treatment with a different product entirely.
- What precautions does 2,4-D and dicamba require?
- PPE and calm conditions. Both are toxic to nearby garden plants and drift on wind, so spray on a still day, strictly per the label, and keep well clear of beds. It is rainproof in about an hour.