Ammonium nonanoate (Axxe)
Rate A 10 to 13% volume to volume (v/v) dilution (13 to 16 fl. oz per gal water) is recommended for most weed control situations and based on the results.
Time Apply to dry plant material, that will remain dry (no rain/no irrigation) for > 2 hr.
Remarks OMRI certified non-selective herbicide for commercial use. Do not allow spray to contact any green plant parts of desirable plants. Provides control and burndown suppression of annual and perennial broadleaf and grass weeds. Spore producing plants such as mosses and liverworts are also controlled.
Caution Causes serious eye irritation.
Site of action N/A
Chemical family N/A
dichlobenil (Casoron 4G)
Rate 4 to 6 lb ai/A (100 to 150 lb./A Casoron)
Time Apply to mineral soil and incorporate 4 to 6 inches deep before placing containers on treated area.
Remarks Consult label for listed crops. Inhibits cell wall production.
Caution Do not transplant into treated soil. Do not use in greenhouses; volatility of dichlobenil may injure nearby plants.
Site of action Group 29: cellulose synthesis inhibitor
Chemical family Nitrile
dimethenamid-P (Tower)
Rate 0.98 to 1.5 lb ai/A (21 to 32 fl oz/A) depending on weed control needed
Time Before container placement
Remarks Apply to bare ground pad such as soil, mulch, gravel, wood chips, or other permeable base. Requires 0.5 inch of water or more after application to activate the herbicide.
Caution Do not apply in greenhouses, polyhouses, or other fully enclosed greenhouse-type structures.
Site of action Group 15: very-long-chain fatty acid synthesis inhibitor
Chemical family Chloroacetamide
pendimethalin (Pendulum Aquacap or 2G)
Rate 2.1 to 4.2 quarts/A Aquacap; 100 to 200 lb/A 2G.
Time Before setting pots and when other vegetation has been removed.
Remarks Will not control emerged weeds but will slow emergence if applied after weed seeds have germinated.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline
prodiamine (Barricade FL)
Rate 0.65 to 1.5 lb ai/A (21 to 48 fl oz/A Barricade 4L)
Time Apply to the soil, gravel, or other permeable surface before placing containers.
Caution Minimize disturbance during hand-weeding to maintain herbicide layer. Apply in fall or spring before weeds germinate.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline