Forgot to say this. Soap, not detergent. Detergent strips the plants natural oils & can burn them. Regular old fashion Joy (remember, not concentrate or ultra), & octagon (lemon, not rose ) are the gentlest on plants. Use 1/2 as much as you would to wash dishes, & half that again for soil flush. You've probably already done this in your gardening, but if not, try it. Your tomatoes, especially, will love u for it.