Food use of exposed parts or from plants showing damage is not recommended. Start after the first light frost. However, questions about margin of safety to grass, residual effect and related issues are unanswered. The recipe calls for 10 oz. Twenty-Mule Team Borax dissolved in 2.5 gal.
Some reports also add a surfactant to the mix.
If treatment is required for bindweed or Canada thistle shoots in the lawn, limit use to individual weed shoots when it is calm and cool late evening. Large area applications should be delayed until fall when non-target vegetable and ornamental plants are less likely to be damaged. Commercial applicators may use products such as Acclaim Extra, or translocated herbicides that will be more effective on larger crabgrass or sandbur in turf. L MOW HIGH and water to keep grass active and competitive with new crabgrass seedlings. Crabgrass will come fast during hot weather if there is moisture.