Buttermilk: Substitute an equal amount of soymilk mixed with lemon juice. Allow the mixture to thicken 5 minutes before using. Or substitute an equal amount of vegan sour cream substitute diluted half and half with water. 1 cup buttermilk = 1 cup soymilk with 2 Tblsp lemon juice allowed to sit 5 minutes. 1 cup buttermilk = 1/2 cup vegan sour cream mixed with 1/2 cup water. Sour Cream: Use a vegan sour cream substitute.
Lay down aged cow manure as a top dressing over recently mowed grass. Use bagged commercial aged manure or buy from a reputable bulk dealer. Manure can be used to top dress grass once or twice a year, with the first application in the early spring and the second in the early fall.
If you do intend to use raw manure as a soil amendment or fertilizer source on your garden, follow these guidelines: Apply raw manure at least 120 days before harvesting a crop that has the potential for soil contact (leafy greens, root crops, etc).