Mix undiluted vinegar with a squirt of dishwashing soap, and spray weeds until they disappear. You'll skip the sketchy chemicals in most store-bought weed killers, and the solution helps keep future generations of weeds at bay.
A Natural Weed Killer and a Beer Trick for Greener Grass

A lot of the water that goes down the drain can be reused to water plants. Water used to steam vegetables, cook potatoes or corn, or boil eggs can go right back onto the soil, nutrients and all (just make sure there's no oil or salt in it). Aquarium water works the same way. Here are two more handy lawn and garden tricks.
Create a Natural Weed Killer
Green Up Your Grass With Beer
There's a surprising fertilizer sitting in your fridge: beer. It's packed with lawn-fortifying nutrients. Mix 1 can of dark beer, 1/2 cup of dish soap, 1 cup of non-diet cola, and 1/2 cup of mouthwash into a lawn sprayer, attach it to the garden hose, and spray the lawn. It delivers good bacteria that green up grass.
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