In my part-time, northern garden, where the growing season feels like a sprint, I’m always looking for plants that can pull double duty.

In 2025, the standout performer wasn’t a vegetable at all—it was the State Fair zinnia.

I planted these alongside my sugar snap peas, radishes, and cosmos, and they didn’t just add colour; they acted as the backbone of the entire patch.

What makes State Fair zinnias special?

You may have noticed these grew significantly larger and sturdier than standard zinnias. That’s because State Fair is a tetraploid variety. In simple terms, while most zinnias have two sets of chromosomes, State Fair has four. This “genetic doubling” results in:

• Jumbo blooms: Massive flowers that can reach 4–6 inches across.
• Stocky strength: Thicker stems that don’t flop over in high winds.
• Disease resistance: They have a much higher natural tolerance to powdery mildew—a lifesaver during our humid August weeks.
• Dahlia-like appearance: Many of the blooms are “double” or “semi-double,” giving them a lush, pom-pom look, making them a great addition to bouquets and floral arrangements.

The zinnias I planted came from either McKenzie seeds or the Niagara Seedy Saturday I attended last year.

If you plan on growing these beautiful flowers, here are a few key features of the State Fair zinnia:

• Plant Type: Flower
• Plant Lifecycle: Annual (plant every year)
• Seed Type: Open Pollinated
• Characteristics: Attracts bees, butterflies, hummingbirds, pollinators and songbirds, Pet friendly, and good for cut flowers
• Planting Method: Direct sow
• Standard Colours: Salmon, orange, pink, rose, scarlet, yellow, and white
• Water Needs: Average 2.5-5 cm (1-2 in.) per week
• Days Until Bloom: 35 – 60 days
• Harvest/Bloom Season: July to Frost (usually October)
• Resistance: Deer and rabbits
• Tolerance: Heat, drought, and dry soil

As State Fair zinnias are so vigorous, they can handle the cool nights of Zone 4 better than almost any other variety. If you’re looking for a “hero” flower that survives until the first hard frost, this is the one.

Stay tuned for a future post explaining how to save zinnia seeds.