For lawns of 400 square feet or less, wet the grass with the tea using a pump sprayer. Use a backpack or walk-behind sprayer for larger lawns. One gallon covers about 1,000 square feet. At minimum, apply the tea in early spring, summer, early fall, and just before the lawn goes dormant, although there's no harm in letting your grass drink the tea more frequently.
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Drill (or drill/driver)
⅜-inch spade bit
3/16 drill bit
Pump sprayer (for applying the compost tea)