You are doing it wrong. Here’s what fertilizer to use on what houseplants

From coffee grounds to banana peels, there’s no shortage of DIY plant food options—but the key is knowing which plant actually benefits from which additive. Below is your detailed, no-nonsense guide to the most common natural fertilizers, what they do, and—most importantly—what plants to use them on and which to avoid.

1. ☕ Coffee Grounds