Using coffee grounds for palms in pots is not a good idea for your ponytail palm. They hold too much moisture and change your soil in ways that stress this drought-loving plant out.
I tested this about two years ago after reading some tips online. I sprinkled used grounds on my ponytail palm's soil for a few weeks. A fuzzy white mold started growing across the top. The grounds packed down into a dense, damp layer that stayed wet long after the rest of the soil had dried. My plant's lower leaves started yellowing, which told me the roots had too much water around them. I scraped off all the grounds, swapped out the top inch of soil, and my plant got back to normal within a month.
The issue comes down to two things: acidity and moisture. Used coffee grounds sit at a pH around 6.0 to 6.8, which is mildly acidic. Your ponytail palm can handle a range of pH levels but does best in neutral soil. The bigger problem is that grounds pack together and hold water like a sponge. Your plant needs soil that dries out fast between waterings. Anything that slows drainage puts your roots at risk of rot.
UF/IFAS says these palms can handle both alkaline and acidic soils. But drainage matters far more than pH for your plant. The moisture that grounds trap goes against what your palm needs most. Some coffee grounds houseplants do fine with the extra dampness. Ferns, azaleas, and blueberry bushes all handle it well. But your ponytail palm should stay far away from them.
So what should you use instead? The best fertilizer for potted palms like yours is a balanced liquid feed diluted to half strength. Look for a mix with equal parts nitrogen, phosphorus, and potassium. A 10-10-10 or 20-20-20 formula works great. Give your plant a dose once a month during spring and summer. Skip feeding from fall through winter since your plant rests during those months.
In my experience, you should pour your diluted feed onto damp soil, never dry soil. This keeps your roots safe from burns. If you spot white crusty buildup on the soil or pot edges, flush everything with plain water. That buildup comes from salts in the fertilizer piling up over time. A good flush every few months keeps your soil clean and healthy for the roots.
Stick with store-bought fertilizer and skip the kitchen scraps for this plant. Your ponytail palm doesn't need rich organic matter at all. It grew up in poor, rocky soil in Mexico and thrives on less rather than more. A simple monthly feeding in the warm months gives your plant everything it needs for strong leaves and a thick caudex. You don't need coffee grounds when a good liquid feed does the job better and safer.
Read the full article: Ponytail Palm Care and Growing Guide
