Like sugar, the common household staple baking soda has uses in the yard. Baking soda boosts your plants to resist pests, fungal growth, and more. So, baking soda is good for your plants in certain instances, but exercise caution, as using too much could kill your plants. It’s great for hunting for pesky weeds, but not great for tending to a sensitive garden.

Technically, dandelions aren’t bad for your lawn, and they don’t directly kill grass. In fact, they appear in areas that are nutrient-deprived, and their long taproots can loosen the soil and bring nutrients closer to the surface. 

However, dandelions do spread quickly, and they can take over your lawn, eventually crowding out grass. This is why a healthy lawn is the best defense against dandelions.

Yes, suggesting companion planting and mulching to minimize new growth.

The most effective way to eliminate quack grass without killing the grass nearby is to overseed the area, keep the seed wet until it grows, mow often, and regularly fertilize the area to promote healthy grass that can choke out the invasive weed.