Using Cinnamon On Plants: A Fungicide, Pesticide, and Rooting Agent

The culinary attributes of Cinnamon are well noted, it’s a great flavoring for a multitude of recipes.

What is not well noted is it’s usefulness in the garden.

The Cinnamon that we know from our kitchens is derived from tree bark – you guessed it, the cinnamon tree.

To the more scientifically astute cinnamon trees are actually a genus or class of trees known as “Cinnamomum“.

Cinnamon as a Fungicide

Black rot fungal diseases from Pythium and Phytophthora fungi are common in many crops. There are multiple strains that are at times devastating.

Cinnamon has proven to not only be a preventative measure against Black rots – but in many cases a cure.

Damping-off is a fungal problem that affects primarily small tender seedlings shortly after they sprout. Cinnamon will work as a preventative measure for damping-off by killing the fungus before it kills the plants.

It works against many common types of mold as well.

Cinnamon has proven more effective than many commercial products currently available. [1] Its active ingredient Cinnamaldehyde is registered for use against Verticillium spot, Dry Bubble from Verticillium, Rhizoctonia, Pythium, Dollar spot, and Pitch canker disease.[3]

Related: Using Baking Soda As A Fungicide

How to Make a Cinnamon Spray For Your Garden

Making a cinnamon spray for plants is relatively easy.

Instructions

  1. Mix 4 tablespoons to a half-gallon of water.
  2. Shake it vigorously and let it sit for a few hours.
  3. Strain the liquid through a sieve or coffee filter.
  4. Put the remaining liquid into a spray bottle.
Sale
Uineko Plastic Spray Bottle (4 Pack, 24 Oz, All-Purpose) Heavy Duty Spraying Bottles Leak Proof Mist Empty Water Bottle for Cleaning Solution Planting Pet with Adjustable Nozzle and Measurements
  • 【ADJUSTABLE NOZZLE】 From a fine mist to a solid stream, the sprayer can be easily adjusted to suit your needs. Be prepared to tackle any job with a simple twist of the nozzle! Avoid waste with our extra-long tube that'll spray every last drop out!
  • 【CHEMICAL RESISTANT】 The heavy duty 24 oz (about 700 ml) sprayer bottle is chemically resistant to hold up against harsh chemicals and solvents. On the side of each bottle is a checklist to stay organized and remain informed as to what the bottle contains. (Also comes with labels to meet your need)
  • 【UPGRADED SPRAY HEAD & LEAK PROOF】 Our sprayer features a long lasting polypropylene spray head, tight and secure cap closure, internal cap gasket, 302 stainless steel spring and a precision valve and piston, for a no clog and no leak experience; A proven and reliable no leak venting system primes quickly and stays primed.

Spray the stems and foliage of any affected plants or any plants you suspect might become affected. Any residue left over when you strained it is still good to spread around the base of the plants, the only reason for straining it was so that it wouldn’t clog up the spray bottle.

Adding some garlic oil gives it an added oomf, the sulfur in the garlic also serves as a natural fungicide against some fungi that the cinnamon doesn’t address.

When you mix in the garlic oil, it will usually separate in solution from the cinnamon water, so has to be shaken vigorously before each use.

Using Cinnamon for Pest Control

Cinnamon uses in the Garden

Cinnamon is also effective in controlling nematodes [2]

Cinnamon is not an alternative insecticide, but it is an inexpensive remedy for Ants – cinnamon is a good deterrent.

It also repels Moths as effectively as mothballs. It has also been suggested against slugs and some beetles but none of this is documented.

Related: Garlic As a Form of Pest Control

Cinnamon as a Rooting Agent

Cinnamon works well as a rooting agent. Cinnamon powder applied to the stem when planting a cutting will stimulate root growth in most plants.

Roll the dampened ends of plant cuttings in cinnamon and it will encourage the growth of additional shoots.

At the same time, it will keep the cutting disease-free while it is developing.

Basic raw honey placed on the plant cutting over the Cinnamon will not only help seal the cinnamon in but serves as a rooting agent in its own right. See – Honey As A Root Hormone

Cinnamaldehyde, cinnamon’s primary active ingredient, promotes root branching by regulating hydrogen sulfide originating in the cutting itself. [4]

See: How Magnets Can Help Plants Grow

McCormick Ground Cinnamon, 7.12 oz
  • Deep, sweet, warm flavor and rich mahogany color
  • Great for baked goods, including cookies, muffins, pies and cinnamon rolls
  • Versatile spice for sweet and savory dishes

Referenced

1. IMPACT OF PLANT OILS AS ANTIFUNGAL ACTIVITY AGAINST FUNGALPATHOGENS OF CINNAMOMUM ZEYLANICUM 

2. Nematicidal Activity of Cassia and Cinnamon Oil Compounds and Related Compounds toward Bursaphelenchus xylophilus (Nematoda: Parasitaphelenchidae)

3. EPA – Cinnamaldehyde (040506) Fact Sheet

4. Cinnamaldehyde promotes root branching by regulating endogenous hydrogen sulfide

5. Evaluation of antifungal properties of octyl gallate and its synergy with cinnamaldehyde