Zinnia Growing Guide
Growing Zinnia is easier than you think. This guide walks you through everything you need — from planting your first seed to harvesting.
At a Glance
Difficulty
Easy
Category
Flower
Sun Exposure
Full Sun
Frost Tolerance
Frost Tender
Growing Zones
Zones 3, 4, 5, 6, 7, 8, 9, 10
Plant Family
Asteraceae
Growing Season
Warm Season
Plant Lifecycle
Annual
Also grows well as
When To Start
First Chance to Plant
7 Days After Last Frost
Last Chance to Plant
30 Days Before First Frost
When should you plant Zinnia?
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Your Zinnia Planting Window
Start planting
May 15, 2026
Last chance
Sep 10, 2026
The Journey Ahead
Zinnia's Lifecycle
Seedling
Mature Plant
Seed Production
Step 1
Prepare Your Space
0.5 cm
Seeding Depth
20 cm
Plant Spacing
45 cm
Row Spacing
4
Plants / Sq Ft
Vertical Growing
Yes – Trellis.
Method: Trellis.
Succession Planting
Yes.
Good Companions
Bad Companions
Step 2
Planting & Sprouting
Expect sprouts in 5–10 days
Growing Tips
- 1Plant zinnias in a spot with full sunlight, as they thrive with at least 6 hours of direct sun each day.
- 2Water them deeply but infrequently, allowing the soil to dry out between waterings to prevent root rot.
- 3Use well-draining soil and space the plants about 12 inches apart to ensure good air circulation, which helps prevent diseases.
- 4Keep an eye out for pests like aphids and spider mites, and use insecticidal soap if needed.
Seedling Phase
Step 3
Growth & Maturity
~60
Days to Maturity
75 cm
Mature Height
30 cm
Mature Width
Pests to Watch For
Diseases to Watch For
Mature Plant
Step 4
Harvesting
Harvest Window
30 days
When to Pick
Harvest flowers at full color
How to Harvest
- 1Harvest Zinnias when the blooms are fully open and the petals are firm to the touch.
- 2Use sharp scissors or pruning shears to cut the stem about 12 inches down, just above a set of leaves, to encourage more blooms.
- 3Avoid pulling the stems to prevent damaging the plant.
Step 5
Saving Seeds
How to Save Seeds
Saving seeds from your Zinnia plant is easy and rewarding, even for new growers! Simply let some of your Zinnia flowers dry out on the plant until the petals are brown and crisp, then gently pull off the dried flower heads and break them apart to find the small, arrow-shaped seeds inside. Collect these seeds and let them air dry for a few days, then store them in a labeled envelope or paper bag in a cool, dry place until you’re ready to plant again. You’ll be amazed at how simple it is to grow next year’s beautiful blooms from your very own saved seeds!
Seed Production
Feeling inspired?
Grow Zinnia from seed.
The cut flower that gives you more flowers the more you cut. Buy a pack and get started.
$2.25
CAD
In Stock
