Growing Zinnias in Zone 4B

Zinnias are the cut-and-come-again champions — the more you cut, the more they bloom.

Zone 4B has a short growing season — start seeds indoors when possible and use season-extending techniques like cold frames and row covers.

Top Growing Tips

• Direct sow after frost — they’re fast growers
• Space properly for air circulation to prevent powdery mildew
• Cut for bouquets regularly — it encourages more flowers
• Benary’s Giant, Oklahoma, and Queen Lime are popular cut flower varieties
• Butterflies love zinnias — plant near vegetable gardens to attract pollinators

Companion Planting

Good companions: any vegetable garden — great pollinator attractors

Avoid planting near: none — zinnias play well with everything

Harvest Timeline

Flowering begins 60-70 days from seed; cut when petals are firm

About Zone 4B

USDA Hardiness Zone 4B has an average last spring frost around May 1 and first fall frost around Oct 1. All planting dates above are calculated from these frost dates. Your specific location may vary — check with your local extension office for the most accurate dates.