Description
Giants of California Mixture Zinnia Seeds 6290.
Massive Semi-Flat Double Blooms on Tall, Robust Stems for Cut Gardens.
Giants of California Mixture Zinnia (Zinnia elegans) is a classic heirloom strain prized for its magnificent, semi-flat double blossoms measuring an impressive 12.5 to 15 cm across. Reaching mature heights of up to 90 cm, these vigorous, free-branching plants feature loosely overlapping petals that form flat, elegant flowers roughly 2.5 cm thick. Yielding an incredible array of bright, clear colours throughout the summer, this mixture is a premier choice for adding towering height to sunny borders and creating stunning, long-lasting cut-flower bouquets.
Quick Seed Details
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Product Code: 6290
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Botanical Name: Zinnia elegans ‘Giants of California Mix’
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Type: Open-Pollinated Annual
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Height: Up to 90 cm
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Flower Size: 12.5–15 cm diameter (approx. 2.5 cm thick)
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Bloom Time: Mid-summer to frost
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Light Requirement: Full Sun
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Soil Preference: Rich, organic, well-drained soil
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Germination: 5–10 days at 22°C
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Seed Depth: Barely cover outdoors (6 mm deep indoors)
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Seed Count: Approx. 100 seeds per packet (100–200 seeds per gram)
What you need to know to Plant & Grow
Giants of California Zinnias germinate rapidly in warm soil and thrive when direct-sown into garden beds.
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Outdoor Direct Sowing (Recommended): Select a sunny location with rich, organic, well-drained soil. Direct sow in late May once soil has warmed thoroughly—avoid planting in cold, damp soil to prevent seed rot. Barely cover seeds with fine soil. Under ideal warm conditions, germination occurs in 5 to 10 days. When seedlings reach 7.5 cm in height, thin plants to 35 cm apart.
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Indoor Sowing: For earlier blooms, start seeds indoors in mid-March. Sow 6 mm deep in peat pots or cell packs to protect delicate roots during transplanting. Maintain a temperature of 22°C for germination, then grow on under lights at 15°C before hardening off and transplanting outside in late May.
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Garden Care: Plant in full sun and water at the soil level to keep foliage dry. Harvest stems frequently or deadhead spent flowers to keep plants branching and blooming continuously until fall.
Why Giants of California Mixture Zinnia Seeds belong in Your Garden
If you want towering garden stems packed with massive, flat-faced double blooms that fill vases effortlessly, Giants of California Mixture is an essential pick. Its robust habit, brilliant colour spectrum, and exceptional performance as a cut flower make it an indispensable annual favourite for Canadian gardens.
