---
title: How Do Worm Castings, Pests, and Algae Affect My Greenhouse Garden?
description: earn about the benefits of worm castings and how to control pests like fungus gnats in your greenhouse garden. Get expert gardening tips from BC Greenhouse
image: https://blog.bcgreenhouses.com/hubfs/SeedlingsH.jpg
---

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# How Do Worm Castings, Pests, and Algae Affect My Greenhouse Garden?

[greenhouses](https://blog.bcgreenhouses.com/tag/greenhouses), [greenhouse garden](https://blog.bcgreenhouses.com/tag/greenhouse-garden), [seeding](https://blog.bcgreenhouses.com/tag/seeding), [garden preparation](https://blog.bcgreenhouses.com/tag/garden-preparation), [BC Greenhouse](https://blog.bcgreenhouses.com/tag/bc-greenhouse), [BC Greenhouses](https://blog.bcgreenhouses.com/tag/bc-greenhouses), [hobby greenhouse](https://blog.bcgreenhouses.com/tag/hobby-greenhouse), [Summer Garden](https://blog.bcgreenhouses.com/tag/summer-garden)

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[Donna Balzer|](https://blog.bcgreenhouses.com/author/donna-balzer)  02.25.2022| 6 MIN READ TIME

### Quick Answer:

Worm castings naturally fertilize plants and support beneficial bugs like fungus gnat predators, but excess moisture and nutrients can also lead to algae growth—use well-draining soil, sticky traps, and fans to balance greenhouse conditions and protect seedlings.

---

## Pests, Worm Castings and Algae

### What are Worm Castings?

Before we get to [greenhouse gardening](https://blog.bcgreenhouses.com/) algae, let's talk about a shopper on Amazon that complained about bugs in her worm castings. If you [don’t speak garden lingo](https://blog.bcgreenhouses.com/greenhouse-garden-tips-maximizing-space-to-grow-your-own-food) yet, worm castings are simply worm poop. They are mixed with soil in garden beds or in pots to make tomatoes grow faster, stronger and healthier. And just in case you missed the memo, worm poop comes with bugs of its own. The good ones.

![Donna Balzer's Spring Greenhouse](https://19607244.fs1.hubspotusercontent-na1.net/hub/19607244/hubfs/Seeds%201.jpeg?width=1200&length=1200&name=Seeds%201.jpeg)

Donna Balzer's Spring Greenhouse

 

Dan Rollingson started selling [Earthly Matters](https://www.amazon.ca/EARTHLY-MATTERS-7L-Worm-CASTINGS/dp/B08LZY1XJY/ref=sr_1_2?dchild=1&keywords=earthly+matters+worm+castings&qid=1618344803&sr=8-2) worm castings on Amazon as soon as he got his worm casting labels sorted with the Canadian Food Inspection Agency.

#### Natural Fertilization

And Dan’s worms are not working alone – they are part of a big movement across North America to fertilize naturally. Where they are different is that they are not sterilized and not pasteurized. They are simply screened to remove big sticks and served up right to your plants and soil.

#### Pests or Friends?

After a few years Dan discovered that the sticks he was screening out and throwing right back into his containers of eating, munching worms were actually breeding bugs good for the garden. [Hypoaspis miles](https://naturalinsectcontrol.com/product/stratiolaelaps-scimitus-formerly-hypoaspis-miles-predator/) (also known as Stratiolaelaps scimitus) are fungus gnat predators.

If you have ever grown houseplants or greenhouse plants you have seen fungus gnats. They are the small black fly that buzzes around your soil as you water. They are more of a problem when the soil is wet, because fungus gnats and algae go hand in hand. I am so glad there is a natural way to control these pesky bugs.

P.S. If you don’t have worm castings but you want the predator you can order them in [separately](https://www.buglogical.com/hypoaspis-miles/fungus-gnat-and-thrips-control-hypoaspis-miles-stratiolaelaps-scimitus/).

You can also buy sticky traps to set up over your soil to see if you have fungus gnats before you buy worm castings or predator bugs. Sticky traps are available at most garden centers or online.

![Sticky Insect Trap](https://19607244.fs1.hubspotusercontent-na1.net/hub/19607244/hubfs/Sticky%20Traps.jpeg?width=1200&length=1200&name=Sticky%20Traps.jpeg)

Sticky Insect Trap

#### And speaking of wet soil:

Kelly-Ann, a Cross Country greenhouse owner asked “Why am I getting mold growing on the surface of my seedlings in the greenhouse? Do I need a fan? How long do I run the fan or is it temperature-dependent?

![Starting Seeds](https://19607244.fs1.hubspotusercontent-na1.net/hub/19607244/hubfs/Wet%20Soil.jpeg?width=1200&length=1200&name=Wet%20Soil.jpeg)

Starting Seeds

### Algae

The answer is, Kelly-Ann probably has greenhouse algae, not mold, growing on the soil in a thin mold-like layer. Algae is actually a simple organism that survives best in wet environments. So, when the soil is wet for too long and hasn’t had a chance to dry out, algae will grow on soil to take advantage of the moisture and nutrients. It is the reason commercial growers often use a soil mix call [Promix- HP](https://www.pthorticulture.com/en/products/pro-mix-hp-mycorrhizae/).  The HP stands for High Porosity.

Kelly-Ann may be adding too much nitrogen, using soil that holds water too long, or, as she mentioned in her question, is in need of a [circulating fan.](https://www.bcgreenhouses.com/accessories/exhaust-fans/caframo-greenhouse-fan/)

Extra nitrogen fertilizer that the plants can’t use has to go somewhere. It is an excellent source of nutrients for water-loving algae.

If you have soil that stays wet for more than 3-4 days, your container size is either too big for the plant or the soil needs changing. There are a lot of wood-based composts and soils on the market but for small seedlings, it is better to use a peat-based mix like Pro-mix HP. I never use actual garden soil because if it has clay it will stay wet too long. If all the soil in Kelly-Ann’s greenhouse is in large beds instead of pots she is facing a larger renovation project and will need to add bags of perlite to the beds until it drains faster.

Then, watering deeply but less often is the advice to keep greenhouse algae at bay.  Remember, the soil surface dries needs to dry out completely before adding more water. It is easy to overwater, especially in cool or cloudy weather.  It’s hard to get the water out once added.

A fan left on 24 hours a day every day helps move the warm air down to the soil level and can help evaporate some of the moisture and discourage the algae. From $40 and up, fans are for sale on the BC Greenhouse Builders [accessories web page](https://www.bcgreenhouses.com/accessories/exhaust-fans/).

## Related/Recent Blogs

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#### [![](https://blog.bcgreenhouses.com/hs-fs/hubfs/Greenhouse%20interior.jpg?width=350&name=Greenhouse%20interior.jpg) by Trevor Dueck | 08.10.2026 | 17 min How Can You Decorate Your Greenhouse to Create a Personal Oasis? Quick Answer: Read More greenhouse tomatoes, greenhouse, growing in a greenhouse, greenhouse cooling, Summer Heat](https://blog.bcgreenhouses.com/how-can-you-decorate-your-greenhouse-to-create-a-personal-oasis)

#### [![](https://blog.bcgreenhouses.com/hs-fs/hubfs/IMG_5365.jpg?width=350&name=IMG_5365.jpg) by Trevor Dueck | 06.29.2026 | 13 min What Are the 5 Strategies for Reducing Mold and Fungus Problems in Greenhouses? Quick Answer: Read More greenhouses, seeding, garden preparation, BC Greenhouse, BC Greenhouses, greenhouse tomatoes, small greenhouse kit, greenhouse tips, growing food, garden transition, greenhouse gardening, greenhouse maintenance, greenhouse, growing in a greenhouse, shade cloth, greenhouse cooling, Greenhouse Temperature, Summer Heat, Greenhouse Ventilation, Tomatoe Growing](https://blog.bcgreenhouses.com/what-are-the-5-strategies-for-reducing-mold-and-fungus-problems-in-greenhouses)

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