Zinnia elegans 'California Giant'
flowerZinnias are the most versatile and rewarding cut-flower annuals for home gardeners. Bright orange, red, yellow, pink, white, and bi-color blooms on sturdy 18 to 36-inch stems make them outstanding in vases and in the garden. They also attract a remarkable variety of butterflies, bees, and beneficial wasps that help control vegetable garden pests.
Sun
full sun
Water
Every 3 days
Bloom
~60 days
Difficulty
easy
Lifecycle
annual
One season, then done
Spacing
12-18 in
Planting Depth
1/4 in
Soil pH
5.5-7.5
Soil Type
Average, well-draining
Hardiness Zones
Zones 3 – 11
Grown as an annual — this range is its winter hardiness, but you can grow it for a single season in any zone.
When to Fertilize
At planting; monthly light feeding through summer
Fertilizer
Balanced 10-10-10 monthly; avoid high nitrogen which favors leaves over blooms
Direct sow after last frost when soil is above 65 F, or start indoors 4 to 6 weeks early for a head start. Zinnias resent root disturbance, so transplant carefully. Full sun is non-negotiable — shaded zinnias grow leggy and bloom poorly. Space generously for airflow because powdery mildew is the primary challenge. Deadhead spent blooms to prolong flowering. A second sowing in midsummer extends bloom into fall.
🌼 Have a different variety?Cultivars of the same species usually share the same basic care — they differ mainly in flower color, height, and bloom form, not in how you grow them. So this guide still applies even if your exact variety isn't the one shown.
Start seeds indoors
Mar 18
Transplant outdoors
Apr 29
Projected first bloom
Jun 28
Good neighbors that attract beneficial insects or deter pests
Proactive ways to stop trouble before it starts — tap a name with an arrow for its full guide
Space plants 12 to 18 inches apart; choose mildew-resistant varieties; apply potassium bicarbonate or neem oil at first sign
Water blast; insecticidal soap; zinnias tend to attract aphid predators naturally
Handpick in morning; neem oil spray; floating row cover on young plants
Avoid overhead watering; remove and bag infected plant material
Cut when the outermost ring of petals is fully open but the center is still tight. Stems cut too early in bud stage do not open fully in the vase. Cut in the morning when flowers are fully hydrated. Recut stems under water and change vase water every 2 days. Vase life is 5 to 12 days. Frequent cutting encourages more blooms.
As a companion plant: exceptional pollinator resource attracting 30+ butterfly species and numerous bee species. Hoverflies and parasitic wasps visiting zinnia flowers also control aphids, whiteflies, and caterpillar pests in adjacent vegetable beds.
For educational and informational purposes only — HomeSown is not medical, health, or other professional advice. Always positively identify any plant before handling or eating it; some plants, and some parts of otherwise-edible plants, are toxic. Consult a qualified professional before consuming or otherwise using any plant, especially if you are pregnant, nursing, taking medication, or have a health condition.