Optimum Temperature for Germination:
70–75°F (21–24°C)
Germination Time:
Typically: 5–10 days
Sub-optimal conditions: Up to 21 days
How to Sow:
• Sow shallowly – barely cover the seeds or gently press into moist soil
• Ideal indoors 4–6 weeks before last frost or direct sow outdoors after danger of frost
• Requires light to germinate – do not bury deeply
Watering:
• Keep soil consistently moist during germination
• Avoid overwatering – soggy soil can cause rot
Light Requirements:
Full sun – Zinnias thrive in bright, direct sunlight
Post-Germination Care:
• Thin seedlings to 6–12 inches apart for airflow and strong growth
• Harden off indoor seedlings before transplanting outdoors
• Water at the base to avoid powdery mildew
• Deadhead spent blooms to encourage continuous flowering
Tips:
• Easy to grow and great for beginners
• Attracts pollinators like bees and butterflies
• Avoid transplanting too early—Zinnias dislike root disturbance
Enjoy vibrant blooms all summer long!