Orchids are sensitive to urea. It is the cheapest form of Nitrogen which is why it is often found in the cheaper brands but like with multivitamins there are better and worse kinds. Miracle gro is not a Fertilizer I would use on my orchids. According to the composition:
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Ingredients. The primary ingredient in Miracle-Gro is urea, which is high in nitrogen. The plant food also contains urea phosphate, potassium chloride, sodium molybdate, ammonium phosphate, zinc sulfate, copper sulfate, chlorine, boric acid, manganese EDTA and ferric sodium EDTA
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Most supermarket fertilizers containe Urea.
The best Fertilizer for orchids available in the uk is this
Rain mix Orchid Fertiliser, potting compost and orchid supplies- Orchid Accessories
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