General Information



NOTE: Gibberellic Acid is an extremely potent plant growth regulator. For best results, read all directions for use thoroughly. Consult your local experiment station specialist, distributor, or the Nufarm agricultural specialist in your area for the spray schedule best suited to your conditions.

Discard any unused spray material at the end of each day. Prepare solution concentrations by mixing the required amount of product with water only in a clean, empty spray tank. Refer to individual crop sections and rate conversion tables provided in the labeling for the amount of GIBGRO 4LS to be applied.

Use only as directed. The label must be read thoroughly and understood before making applications. Effectiveness requires that all parts of plant or crop must receive spray or desired result will not occur, so spray thoroughly. When a range of rates is indicated, use the concentration and spray volume recommended locally.

Data concerning the compatibility of GIBGRO 4LS with other agricultural compounds is not available, except where specified.


To assure the compatibility of GIBGRO 4LS with other products, pour the products into a small container of water in the correct proportions.

After thorough mixing, let stand for 5 minutes. If the combination remains mixed, or can be remixed readily, the mixture is compatible.

Limitations, Restrictions, and Exceptions


All states except California.

To increase runner production of mother plants: Apply a single spray to mother plants 10 to 30 days after planting. At the time of spraying, plants must have 1 to 6 leaves. Apply 100 gallons per acre to thoroughly wet new foliage to the point of run-off. Use 15 to 25 grams a.i. per acre.

NOTE: Not for use on fruiting plants. Effectiveness of treatments can be reduced on planting set out after mid May. Response to application of GIBGRO 4LS varies with cultivar and location. Consult a Nufarm representative or local horticulturist for specific information in your area.

Restricted Entry Interval

4 hours

Exception: If the product is soil-injected or soil-incorporated, the Worker Protection Standard, under certain circumstances, allows workers to enter the treated area if there will be no contact with anything that has been treated.