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How to Get Rid of Ants on Dahlia Plant

Updated: December 23, 2022

Dahlias are stunning flowers that bring color and life to gardens. However, they can attract ants, which can cause damage to the plant. Ants are attracted to the sweet nectar produced by the dahlia flowers and can also farm aphids on the plant for their honeydew. The good news is that there are several natural and chemical methods to get rid of ants on dahlia plants.

Natural Methods

1. Use Soap and Water

Mix a few drops of dish soap into a spray bottle filled with water. Spray the mixture onto the affected areas of the dahlia plant. The soap will suffocate the ants, and the water will wash them away.

2. Diatomaceous Earth

Sprinkle food-grade diatomaceous earth around the base of the dahlia plant. This will dehydrate and kill ants when they come in contact with it.

3. Cinnamon

Sprinkle cinnamon around the base of the dahlia plant or wherever ants are present. Cinnamon contains an essential oil that repels ants and other insects.

Chemical Methods

1. Ant Baits

Place ant baits around the garden, close to the dahlia plant. Ants will carry the bait back to their nest, which will eventually kill off the entire colony.

2. Insecticides

Use insecticides labeled for use on ants and apply them directly to ant nests or around the base of the dahlia plant. This method should only be used as a last resort since it can also harm beneficial insects like bees and butterflies.

3. Ant Traps

Place ant traps around your garden near your Dahlia plant or where ants are present. Ant traps work by attracting ants with a sweet-smelling bait, which they then carry back to their colony. The bait contains a slow-acting poison that will kill the entire colony.


Preventing ants from infesting your dahlia plants is the best approach. Here are a few prevention methods:

  • Regularly prune the dahlia plant to remove dead or decaying plant matter, which can attract ants.
  • Keep your garden clean and free of debris.
  • Create a barrier around the base of the dahlia plant using materials like diatomaceous earth or cinnamon.
  • Use sticky barriers around the base of the dahlia plant to prevent ants from climbing up.


Can ants harm Dahlia Plant?

Yes, ant infestation can cause damage to Dahlia plants by spreading aphids which are harmful to plants.

Can I use vinegar to get rid of ants on Dahlia Plant?

Vinegar can help repel ants, but it’s not an effective solution for getting rid of them. It may also harm your plants if used in large quantities.

How often should I check for ant infestations on my Dahlia Plant?

It’s best to check your dahlia plant for ant infestations regularly, especially during warm weather when ants are most active. Once every two weeks is recommended.

How long does it take for ant baits to work?

Ant baits can take anywhere from a few days to several weeks, depending on the size of the colony and the type of bait used.

In conclusion, getting rid of ants on dahlia plants requires some effort and patience, but it is essential for the health and beauty of your garden. Natural methods like soap and water, diatomaceous earth, and cinnamon are effective at repelling and killing ants. Chemical methods like ant baits, insecticides, and traps should be used as a last resort. Preventing ant infestations is the best approach, and regular upkeep of your garden will help keep ants at bay.