The Blooming Joy Journal

20 Zinnia Facts Every Gardener Should Know

By Kara Jamison · April 16, 2025

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This blog post contains affiliate links to products that I love for cut flower growing and I may make a small commission when you purchase through my links. I appreciate you and helping me continue this blog of cut flower growing joy & information! - Kara Jamison

Zinnias are the Joy of Summer

I can't imagine a summer without growing Zinnias in the cut flower garden. In fact, Zinnias were one of the first cut flowers I ever grew and they gave me the confidence to learn how to grow even more types of flowers. Zinnias are the stars of the summer garden that are bright, bold, and continually blooming because they are excellent cut and come again flowers. Whether you're just starting your cut flower garden or looking to fill your flower beds with color and joy, zinnias are one of the easiest and most rewarding flowers to grow.

In this post, I’m sharing 20 helpful and inspiring facts about growing, harvesting, and designing with zinnias so you can make the most of these vibrant blooms all season long.

🌱 Growing Zinnias

Zinnias are warm-season annuals that thrive in full sun and well-draining soil. Zinnias do not tolerate frost! Plant well after frost danger is gone.
Direct sow after your last frost date—zinnias love warm soil and germinate quickly. I find if you wait a few weeks after your last danger of frost, the ground has really warmed up and Zinnia seeds germinate and grow super fast!
Pinching zinnias at 8–12 inches tall encourages branching and more blooms. I show you how in this video.
They’re drought-tolerant once established, but consistent watering helps them thrive. Here in Middle Tennessee, we get enough rain throughout the summer that I rarely have to water extra.
Zinnias don’t like to be crowded—space plants 9–12 inches apart for airflow and fewer fungal issues. Y
Powdery mildew can be a problem, especially in humid climates. Good spacing helps prevent it but I'll be honest after years of growing Zinnias.....sometimes you can do everything right and the powdery mildew still comes. It's just part of growing Zinnias. You can apply sprays to help keep the fungal pressure down but I do not spray at my farm.
Zinnias are one of the best beginner flowers to grow—they’re quick to bloom and very forgiving. Zinnias are one of the first cut flowers I grew that started this now life long passion to help others grow a cut flower garden.
They attract pollinators like bees, butterflies, and even hummingbirds to your garden. Seriously, you will find it to be so fun to take your morning coffee to the garden and watch the butterflies fluttery around your Zinnias!
You can succession sow zinnias every few weeks to ensure continuous blooms all summer. Tip: Sow fall colors of your later successions for autumn seasonal color! Add this Fireball Blend Zinnia to your fall cut flower color plan.
They’re perfect for a full sun flower bed and mix beautifully with other summer annuals. I love to mix Cosmos in with my Zinnias!

✂️ Harvesting Zinnias

Zinnias pass the "wiggle test" when they’re ready to be cut if the stem stays firm when shaken, they’re good to harvest. Want to see a visual? Check out this YouTube video I created to show you!
Cut early in the morning or late in the day when the flowers are most hydrated.
Harvest regularly to encourage more blooms The more you cut, the more they produce more blooms!
Use clean, sharp snips to avoid crushing stems or damaging plants. I like to use these cute pink shears to cut zinnias!
Strip the lower leaves before placing zinnias in water to avoid bacterial growth. In fact, I only leave about 1/3 of leaves on any flower stem. This helps the flower head take in water well.
Zinnias can last 7 days in a vase if properly conditioned and the water is changed regularly. I find that they can last even longer than a week. I am not exactly sure why, but I find these Zinnias seem to last the longest in a vase verse any other Zinnia I've ever grown.

💐 Designing with Zinnias

Zinnias come in a rainbow of colors, making them incredibly versatile for summer bouquets. I love this mix of Zinnias for a rainbow of colors.
Varieties like ‘Benary’s Giant’ and ‘Queen Lime’ offer unique colors and textures for floral design.
They pair well with herbs and filler flowers like basil, gomphrena, and Cosmos for lush garden-style arrangements.
Zinnias are a cheerful focal flower and add a wildflower charm to wedding or market bouquets.

Zinnias are the Joy of Summer

🌱 Growing Zinnias

✂️ Harvesting Zinnias

💐 Designing with Zinnias

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