Plants get essential nutrients from the soil, but if they're in short supply fertilizer is the supplement.
Fertilizer: Vitamins for Plants
![Bat guano fertilizer.](https://npr.brightspotcdn.com/dims4/default/9dd5c61/2147483647/strip/true/crop/426x640+0+0/resize/880x1322!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Flegacy%2Fsites%2Fwrkf%2Ffiles%2F201302%2F4865610679_c4a931299e_z.jpg)
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Plants get essential nutrients from the soil, but if they're in short supply fertilizer is the supplement.