Short answer: harvester ants are seed-eating ants made famous by classic ant farms. In Canada, the main options are western harvester ants (Pogonomyrmex occidentalis) and Canary Islands harvester ants (Messor minor). They love heat, eat mostly seeds, and don't need hibernation, so they're active all year.
Western harvester ant (Pogonomyrmex occidentalis)
- Difficulty: beginner, and very hardy.
- Diet: thrives on seeds, plus some insects.
- Heat: loves warmth, so use a heat mat or cable under part of the nest.
- Hibernation: not needed.
- Founding: queens are semi-claustral, so a founding queen needs a small foraging area with food.
- Good to know: we import these queens legally from the United States.
Canary Islands harvester ant (Messor minor)
- Difficulty: beginner friendly, but young colonies are sensitive to light.
- Temperature: nest 23–28 °C, outworld 25–30 °C, so a heat mat, cable or lamp is recommended.
- Humidity: nest 50–70%, outworld 30–50%.
- Diet: mainly seeds. Young colonies need small seeds such as dandelion or poppy, with cereals only as a supplement. Protein isn't strictly needed but helps.
- Housing: they need a dry area and a wet area. They dig, so housing must be escape-proof. Give water through absorbent material, because open water can drown them.
- Colony size: one queen, with colonies reaching 15,000–50,000 workers. Queens can live up to 25 years.
- Hibernation: not needed. They're active year-round.
Messor minor care sheet · "Black" colonies · "Red" colonies
What to feed harvester ants
Seeds are the staple. Good options include dandelion, poppy, nyjer, amaranth, millet, Kentucky bluegrass and birdseed. Size the seeds to the colony: small colonies need small seeds. Add some insect protein and sugar water (1 part sugar to 4 parts water) for faster growth. See What do pet ants eat?
Other seed-eating ants
Big-headed ants (Pheidole) and pavement ants (Tetramorium) also eat seeds. Pavement ants are the easiest ant to keep, and a great budget alternative. See What ants should I start with?
Frequently asked questions
Are harvester ants good for beginners?
Yes. Western harvester ants are hardy and don't need hibernation. Just give them warmth and seeds.
Do harvester ants sting?
Pogonomyrmex can sting, so handle the setup carefully and keep good escape prevention.
Can I put harvester ants in a Hydrostone nest?
We don't recommend it for Messor. They're destructive diggers.