What is this cloud of tiny insects over my garden soil?

What's likely going on

In the photo it looks like a shimmering cloud of tiny dots moving above damp soil and leaves. When this happens in gardens, it is almost always a swarm of small flies or gnats rather than anything coming from the plants themselves.

Two common possibilities:

1. Non‑biting midges or gnats outdoors – These form loose “clouds” that hover in one spot, often in the evening, over damp ground, drains, ponds or heaps of wet leaves. They don’t usually hurt plants, but they can be annoying.
2. Fungus gnats (if near pots or very wet soil) – These are tiny black flies whose larvae live in constantly moist soil rich in rotting organic matter. They’re mostly a nuisance, but heavy infestations can damage very young seedlings or cuttings.

From the image (lots of leaf litter and shaded greenery), a midge/gnat swarm over moist debris is the most likely explanation.

What to do

1. Disturb the area – Rake or lightly turn the leaf litter/soil where the swarm is hovering. This breaks up their resting/breeding spot.
2. Reduce excess moisture – Improve drainage, avoid over‑watering nearby beds, and empty any trays, pots, or containers holding standing water.
3. Clean up decaying material – Remove thick mats of wet leaves, rotting fruit, or other debris where larvae might be developing.
4. Use simple traps if they’re a nuisance – A bowl of water with a drop of dish soap placed nearby, or yellow sticky cards, can catch a lot of adults without chemicals.
5. Avoid strong pesticides first – Sprays for flying insects also affect beneficial bugs; try the physical cleanup and drier conditions before using chemicals.

How to prevent it

• Keep garden soil and leaf piles moist but not constantly soggy.
• Regularly thin out heavy leaf litter and compost it properly.
• Make sure nearby drains, birdbaths, and containers don’t hold stagnant water.

When to worry

• If swarms are inside the house coming from potting soil, or seedlings are wilting with lots of tiny flies, look up “fungus gnats” and treat the pots specifically.
• If people or pets are being bitten, you may be dealing with mosquitoes; then focus on eliminating all standing water and consider local control measures.

Otherwise, these clouds of tiny insects are mostly just a sign of damp, organic‑rich spots in the garden and usually fade once conditions dry out a bit.