Why Are There Black Spots On The Leaves

Question

I noticed a few of my new heart leaf fern have black spots.

Answer 1

Many indoor plant problems are due to overwatering. Heart fern needs a moist soil, but it must be well draining, or root rot can set in. Heart fern also needs high humidity. You can provide that with a pebble tray. Here are more care tips that should help:

https://www.gardeningknowhow.com/ornamental/foliage/heart-leaf-fern/growing-heart-ferns.htm

Pests like aphids and scale can be a problem. Treat them by rinsing them off under water, or use Neem oil. The insects excrete a honeydew that breeds sooty mold, which looks like a lot of tiny, black dots.