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5 do-it-yourself fungus fighting recipes

By: Garden Gate staff
Are blackspot and powdery mildew getting to your plants? You probably have an entire anti-fungus tool kit in your kitchen. Here are five quick recipes to fight fungal disease.

There really is a fungus among us. Several, actually. Blackspot, powdery mildew and damping off are all common fungus problems that every gardener has to deal with from time to time.

Of course, you can choose plants that are resistant to fungal diseases, and cleaning up fallen leaves and spreading fresh mulch every spring will help, too. But sometimes it’s not enough. However, a quick sweep through your kitchen cupboards, and you might find just what you need to fight against these persistent diseases without chemicals. All of the recipes here are nontoxic and won’t harm kids, pets, wildlife or insects. Plus, they’re inexpensive and made from common ingredients, so you might not even have to make a trip to the store. Scroll on to learn more about making each recipe.


1) Chamomile tea

When you’re starting seedlings, you hate to see them die from damping off — when the tops of seedlings just fall over because the stem has rotted. Chamomile contains sulfur, which fights this fungus.


  • 1 chamomile tea bag
  • 1 quart water

Soak the tea bag in cool water for 15 to 20 minutes. (A used tea bag will work just fine, too.) Mist the solution over seedlings and young plants, or use it to water flats from the bottom.


2) Cornmeal

This home remedy is said to promote the growth of a good fungus that competes with the fungi that cause diseases, such as blackspot. Cornmeal gives plants a few extra nutrients, too!


  • ½ cup cornmeal per plant
  • Bark mulch

Sprinkle ½ cup of cornmeal around every plant, then cover it with a layer of bark mulch.


3) Cinnamon

Orchid growers use cinnamon to fight fungal leaf spots.


  • Dip your fingertip in ground cinnamon and rub it gently over the affected area. Don’t use too much, though, as it can burn the leaves.
  • You can also sprinkle cinnamon lightly over the surface of potting mix to stop damping off for all types of plant seedlings.


4) Milk

It’s hard to believe that something as mild as milk could fight fungus, but it does. The theory is that it coats leaves so spores can’t embed themselves in the leaf surface, although proteins or lactic acid may play a role, too.


  • 3 cups water
  • 1⁄3 cup milk, whole or skim

Shake this mixture well and spray it on the plants until the leaves drip. When you’re done, discard the leftovers. This spray can help cut down on powdery mildew if you treat plants before you see symptoms.

Try it on garden phlox (Phlox paniculata), bee balm (Monarda didyma), cucumbers and other vine crops. Unlike some fungicides, it’s safe to use on plants with fuzzy leaves. (And no, it doesn’t smell!)


5) Baking soda and soap

If you love roses (Rosa hybrids), you dread the arrival of blackspot. Here’s something to help keep this condition at bay.


  • 1 quart water
  • 1 tsp. baking soda
  • ½ tsp. liquid soap (Use mild soap, such as Ivory®, not detergent, which will harm plants)

Combine the listed ingredients in a spray bottle, shake it thoroughly and apply to the tops and undersides of leaves. Use it on cloudy days or in the evening, as this mixture can burn foliage on a hot, sunny day. It works best if you spray plants before you see symptoms, although if the leaves already have a few blotches, it’ll keep blackspot from getting worse.

Published: Aug. 7, 2018

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