Build a DIY Weed Dabber for Precise Herbicide Application

Why Spot-Treat with a Weed Dabber?

Spraying non-selective herbicides like glyphosate risks drift onto desirable plants and over-application. A weed dabber delivers herbicide only to target weeds—efficient, economical, and safe for surrounding vegetation.

Materials (All from Hardware Store)

• 1½" PVC pipe, 30" long (buy a 10' length, it’s inexpensive)
• 1½" PVC cap
• PVC-to-pipe-thread adapter (1½" → ¾" male)
• ¾" male pipe to male garden hose adapter
• Garden hose cap with rubber washer
• PVC primer and cement
• Pipe dope or Teflon tape
• Household sponge (1½" square)
• Fine mesh screen or onion bag
• Hose clamp or electrical tape
• 1/16" drill bit

Assembly Steps

1. Clean and glue PVC cap on one end; glue adapter on the other.
2. Apply pipe dope/Teflon tape to threads; screw on garden hose adapter, then hose cap.
3. Drill a tiny hole (start with 1/16") in center of the pipe cap.
4. Place sponge over hole; cover with mesh; secure with hose clamp or tape.
5. Remove hose cap; fill pipe with ready-to-use glyphosate; replace cap tightly.

How It Works

Herbicide seeps through the hole, saturating the sponge. The sealed cap creates a vacuum that prevents leakage. Dab weeds until sponge is damp—not dripping. Re-tighten or invert briefly to release more fluid if sponge dries.

Usage Tips

• Effects visible in ~1 week (temperature-dependent).
• Read and follow herbicide label completely.
• Dedicate this tool solely to herbicide—never use for other liquids.

This simple, reusable tool gives you surgical precision for weed control without collateral damage.