What Plants Don’t Like Coffee Grounds

What Plants Don’t Like Coffee Grounds

Coffee grounds are often used as a natural fertiliser in gardens, but not all plants benefit from them. Understanding what plants don’t like coffee grounds can help you avoid damaging your flowers, vegetables, or shrubs.

Why Some Plants Dislike Coffee Grounds

Used coffee grounds are acidic and contain compounds like caffeine and nitrogen. While these can be beneficial in moderation for some plants, too much can:

  • Alter soil pH levels, making it more acidic.

  • Inhibit seed germination.

  • Attract pests if left on the surface.

Plants That Don’t Like Coffee Grounds

Certain plants are sensitive to acidity or chemicals in coffee grounds. Avoid adding coffee grounds to:

  • Lilies – prefer neutral to slightly alkaline soil.

  • Ferns – acidic coffee can damage leaves.

  • Succulents and Cacti – thrive in well-draining, low-nutrient soil.

  • Hydrangeas (depending on variety) – some types may react poorly to extra acidity.

  • Vegetables like beans and peas – nitrogen-rich coffee can inhibit growth.

Instead, use coffee grounds sparingly for acid-loving plants like azaleas, rhododendrons, or blueberries.

How to Use Coffee Grounds Safely in the Garden

Even for plants that tolerate acidity, coffee grounds should be used correctly:

  • Mix into soil rather than leaving on the surface.

  • Compost coffee grounds with other materials for a balanced nutrient mix.

  • Limit quantity — a thin layer once in a while is enough.

Alternative Uses for Coffee Grounds

If you have plants that dislike coffee grounds, here are other ways to put them to good use:

  • Fertiliser for acid-loving plants – like blueberries or azaleas.

  • Composting – helps balance green and brown waste.

  • Pest deterrent – can repel slugs and snails in small quantities.

  • Household cleaning – scrubs and deodorises surfaces.

Tips for Gardeners

  1. Know your soil type — some plants prefer neutral or alkaline soils.

  2. Observe plant reaction — remove coffee grounds if leaves yellow or growth slows.

  3. Pair with other organic matter — balance nutrients using compost or mulch.

  4. Don’t overuse — moderation is key to avoiding harm.

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