So the best reason I can think of that Miracle Gro is bad is that it is not good for soil microbes. The problem with MG is that the nitrogen is derived from synthetic ammonium and nitrates, producing off-chemicals that are harmful to soil microbes, worms, and … The rumor that poinsettias are poisonous has been around since 1919. I’ve switched my growing medium to peat moss, black kow, and perlite, and I’ve switched all my fertilizers to Ferti-Lome. The salty chemicals in Miracle Gro are not in any of the food groups (protein, vitamins, minerals, or carbohydrates). 1 decade ago. willcinovid. I suspect that if they were as harmful to plant growth/vegetable productivity and soil health as many organic gardeners seem to think that the company/fertilizer formulas would not have lasted this long (and 90% of all gardens in America would be sterile dirt). Favorite Answer. Can Miracle Grow go bad? My garden has grown pretty well and I have harvested a lot of fresh produce from it. 3 Answers. Miracle-Gro all-purpose potting mix is designed to be practical for almost any form of gardening. by Rocketboy9 Hello again my fellow cultivators, I hope everyone’s day went as planned. Miracle Grow fertilizers have been on the market for over fifty years. Miracle-Gro marijuana gardening promoters forget to mention that Scotts' soils are known as fungus gnat farms and cause a lots of problems for marijuana. Lv 4. When I allegedly grew cannabis in Texas I made a lot of mistakes and growing Miracle-Gro marijuana was one of the bigger ones. Poinsettias Are Not Poisonous. I have been using that kind of soil and lasagna layers (soil, newspaper, leaves, compost; then repeat layers) to grow my garden for a couple years. You just have to be a good enough grower to use it. Re: Is Miracle Grow bad? I have some powdered miracle grow that you mix with water. Earthworms may be good for garden-soil tilth and productivity, but they may still be bad for the larger environment, including forests. Today I’m going to talk about soil again, more specifically bad soil. It's more like old vitamins in your medicine shelf. Fertilizer does not go bad. All of Scott's Miracle-Gro soil mixes are perfectly safe for growing vegetables and other food crops. Thus while the plants will benefit briefly from the chemicals, the soil microbes which normally provide plant food, will suffer. University and hospital research has shown that the plants are not toxic to humans or pets. Answer Save. So is the Miracle Gro soil bad too? Relevance. Miracle-Gro provides an insane amount of nitrogen to plants so that they grow big, bushy, green, and really fast. The Scott's Miracle-Gro line of pre-mixed soils includes specialty soils for a variety of plants and shrubs. Miracle Grow has been around for decades and wouldn't be as popular as it is if it didn't work. 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