The plants that you should not put coffee grounds around are young seedlings, broccoli, tomatoes, asparagus, thyme, lavender, rosemary, cacti and succulents.
These plants should not be around coffee grounds or have coffee grounds added to their soils as the coffee grounds can add acidity to the soil, and can retain too much moisture and even potentially harm the delicate roots or interfere with the plants preferred soil conditions.
Coffee grounds should not be used for plants which include.
Legumes and clovers as they fix their own nitrogen and don't require the added nitrogen from coffee grounds.
Flowering plants like Achillea, Campanula, Salvia, Lilacs, Roses, Orchids, Petunias, Hydrangeas and Geraniums should not have coffee grounds around them as some prefer neutral to alkaline soil, and can also be negatively affected by the added acidity, although the hydrangeas are an exception that likes acidity.
Some ferns like asparagus fern, don't do well with coffee grounds.
Young plants and seedlings should not use coffee grounds as the delicate roots can be burned by the acidity and potential mold growth.
Vegetables that should not use coffee grounds are mustard greens, potatoes, eggplant, corn, lettuce, carrots, beetroot, spinach, cabbage, broccoli, tomatoes and asparagus as many of these prefer neutral to alkaline soil and are also sensitive to acidity or even altered soil.
And herbs like rosemary, lavender, thyme, oregano and sage are Mediterranean herbs that prefer alkaline and dry conditions that the coffee grounds can disrupt so they should not use coffee grounds.
And succulents and cacti like snake plants, Jade, Christmas Cactus and Aloe Vera also should not have coffee grounds around them as they prefer fast draining and less acidic soil and dislike the moisture retention.
Coffee grounds are great for some plants, but not all plants like them or do well with them.