Can You Rejuvenate Old Carnivorous Plant Soil with Coffee? Not Recommended

Adding coffee to spent peat moss increases acidity but **also adds nitrogen** – which burns most carnivorous plant roots. The exception: some Nepenthes growers experiment with tiny amounts of coffee grounds or weak coffee watering.

Better Approach

• Compost old peat – it develops harmful anaerobic byproducts as it breaks down.
• Use fresh 50/50 peat/perlite for Sarracenia, Dionaea, and temperate Drosera.
• For Nepenthes, a bark/sphagnum/perlite mix lasts years without rejuvenation.

If you experiment with coffee, test on a few expendable plants first. But fresh media is always safer and more reliable.