The benefit of coffee grounds doesn't stop at warding away those slime-ball slugs but also has a great nutritional value to your plants, nitrogen! Plants need nitrogen in order to grow lush and happy leaves, should you find that your plant is stunted in growth or exhibits sallow, yellow leaves when they obviously should be green, nitrogen just may be the thing that you need, and what do you know?! You really want to make yourself a cup of coffee right now, what a coincidence. So it's awesome that you can add nitrogen right into the ground so easily but be careful not to over-do it. A sprinkle once in a while should be okay but coffee grounds which is highly acidic can do more harm than good if sprinkled too often, the acidity of the coffee grounds can burn the leaves and probably other vital parts of your growing plant.
If you find that your plants are tall, lanky and weak under its own weight you may have a case of excess nitrogen. Excess nitrogen causes plants to be so focused on building up their leaves that they forget to flower, fruit and grow strong in other areas where they should be, *ahem, for example the stem, hence the tall, lanky and weak characteristics of over-nitrogen'd plants. But if you absolutely love the fact that you can use your coffee ground for your plants (like me) and find yourself debating whether or not to use the coffee grounds... again (also like me), simply toss the filter and grounds into the compost, in almost no time at all you'll be able to use it all over your garden without it be too acid-harmful to your plants.
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