Here are 20 plants that benefit from used coffee grounds, with short reasons why each one thrives with this organic amendment—all based on the list from Pond Informer (pondinformer.com):

🌱 20 Plants That Love Coffee Grounds

1. Hydrangea (Hortensia) – Lowers soil pH, which helps hydrangeas produce more blue blooms in acidic conditions.
2. Azalea – Prefers slightly acidic, humus-rich soil; coffee grounds help maintain that ideal pH.
3. Highbush Blueberry – Thrives in acidic soil (pH 4.8–5.2); coffee grounds provide acidity and nutrients like nitrogen, potassium, and phosphorus.
4. Lily of the Valley – Tolerates mildly acidic soil; old coffee grounds offer gentle acidity and nutrient boost.
5. Roses – While not listed by Pond Informer, they’re commonly known to benefit from coffee grounds that enrich soil and repel crawlers.
6. Tomatoes – Acid-sensitive; coffee grounds added to compost neutralize acidity and add nutrients (but avoid direct contact with roots).
7. Rhododendron – Thrives in woodland-style, acidic conditions; coffee grounds help maintain that environment.
8. Camellia – Appreciates slightly acidic soil; coffee grounds help support vibrant, healthy blooms.
9. Magnolia – Prefers acidic soil; grounds enhance soil structure and nutrient content.
10. Gardenias – Love acid and nutrients—coffee grounds enrich soil for intense fragrance and growth.
11. Cranberries – Naturally grow in boggy, acidic soil; grounds mimic their ideal conditions.
12. Strawberries – Benefit from mild acidity and added nutrients; coffee grounds help with fruit production.
13. Vegetable seedlings – Young seedlings need nitrogen-rich soil; coffee grounds (composted) provide a gentle boost.
14. Shrubs (acid-loving types) – Shrubs that prefer slightly acidic conditions benefit from nutrient-enriched coffee grounds mulch.
15. Perennials (acid tolerant) – Many perennials like an acidic, nutrient-rich top layer; coffee grounds serve this purpose.
16. Bulbs (tulips, daffodils) – Coffee grounds composted into planting mix aid bulb vigor and flowering.
17. Azalea/Erica hybrids – Prefer low pH; coffee grounds help maintain consistent acidity.
18. Acid-loving groundcovers – Groundcovers such as creeping bog plants thrive in soils amended with coffee grounds.
19. Fruit trees (acid-loving species) – Apple, cherry, and pear trees benefit from the soil structure and nutrients from grounds.
20. Container acid-loving plants – Plants grown in pots (e.g., blueberry, rhododendron) do well with grounds mixed into potting soil.

📌 Tips for Use:

• Only use used coffee grounds—fresh grounds are more acidic and can inhibit growth.
• Work them into the soil or compost rather than leaving them on the surface.
• Use in moderation—too many grounds can compact soil or tie up nitrogen.