Q&A for How to Water Plants with Coffee

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  • Question
    If I'm not supposed to water leaves on roses, should the coffee still be used?
    Community Answer
    Community Answer
    Watering the leaves is not an issue, since they grow outside and are exposed to rain. Powdery mildew is fairly common in roses whether you water the leaves or not.
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  • Question
    Can I spray coffee on my hot pepper plants?
    Ninox
    Ninox
    Top Answerer
    Yes. Pepper plants need a lot of nitrogen, and coffee has a high concentration of nitrogen.
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  • Question
    Will coffee grounds help with compost for outside?
    Ninox
    Ninox
    Top Answerer
    Yes, coffee grounds can be used inside and outside to add phosphate and nitrogen.
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  • Question
    Is coffee good for bougainvillea ?
    Ninox
    Ninox
    Top Answerer
    Coffee will acidify the soil, which is good for bougainvillea, but the most important thing is that they're getting enough light.
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  • Question
    Can instant coffee be used for houseplants?
    Ninox
    Ninox
    Top Answerer
    Yes, instant coffee added to the soil is a good repellent for insects, as well as fertilizer. However, instant coffee can't be used as a replacement for soil.
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  • Question
    Can I water my spinach with coffee grounds and water?
    Ninox
    Ninox
    Top Answerer
    Yes. Coffee contains nitrogen, which is very useful to grow spinach, lettuce and other leaf vegetables.
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  • Question
    Can I grow lima beans using only plain liquid coffee without any water?
    Community Answer
    Community Answer
    It's unlikely, as coffee has many phytotoxic properties (meaning it's not good for plants).
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