When your clients demand maximum color impact in the hottest, sunniest locations on the property, two vinca series consistently rise to the top: Vinca Blockbuster and Vinca Valiant™. Both are bred for exceptional heat tolerance, large showy blooms, and season-long performance — but each brings distinct characteristics that make them the right choice for different production goals.
This guide covers the full color lineup for both series, how to grow them from bulk seed, and how to choose between them for your landscape, retail, or commercial production program.
Vinca Blockbuster Series – Maximum Bloom Size, Unstoppable Heat Performance
The Blockbuster name says it all. This series produces some of the largest vinca flowers available — blooms reaching up to 2.5 inches across — on a vigorous, well-branched plant that tops out at 14–18 inches tall. Blockbuster is the go-to choice for growers who want high visual impact in retail displays, large landscape beds, and commercial installs where bold color from a distance is the priority.
Key characteristics of the Blockbuster series:
- Exceptionally large blooms — up to 2.5" across, among the largest in the vinca category
- Vigorous, upright habit — 14–18 inches tall with strong branching and excellent canopy coverage
- Outstanding heat and drought tolerance — thrives in full sun through peak summer heat
- Continuous bloom — self-cleaning flowers with no deadheading required
- Wide color range — 10 colors including solids, bicolors, and a formula mix
Shop Vinca Blockbuster Seeds in Bulk
- Vinca Blockbuster Formula Mix – 1,000 Bulk Seeds
- Vinca Blockbuster Apricot – 1,000 Bulk Seeds
- Vinca Blockbuster Blush – 1,000 Bulk Seeds
- Vinca Blockbuster Blue – 1,000 Bulk Seeds
- Vinca Blockbuster Burgundy – 1,000 Bulk Seeds
- Vinca Blockbuster Crimson – 1,000 Bulk Seeds
- Vinca Blockbuster Punch – 1,000 Bulk Seeds
- Vinca Blockbuster Purple – 1,000 Bulk Seeds
- Vinca Blockbuster Red Eye – 1,000 Bulk Seeds
- Vinca Blockbuster White – 1,000 Bulk Seeds
Need smaller retail packs? Visit www.trailingpetunia.com for individual quantities.
Vinca Valiant™ Series – Heat Champion with Refined Color Palette
Vinca Valiant™ is bred specifically for extreme heat performance — one of the most heat-tolerant vinca series available for North American production. Where other annuals fade and stall in midsummer heat, Valiant™ accelerates, producing more flowers as temperatures climb. With a compact-to-medium habit of 12–16 inches and a refined color palette of 8 colors, Valiant™ is ideal for premium landscape installs, quart and gallon container production, and retail programs targeting upscale garden center customers.
Key characteristics of the Valiant™ series:
- Extreme heat tolerance — bred to perform in USDA zones 9–11 and hot summer climates across North America
- Compact-to-medium habit — 12–16 inches tall, well-branched and mounded
- Refined color palette — 8 colors including soft apricot, lilac, magenta, and pure white
- Premium retail appeal — clean, sophisticated colors that sell well in upscale garden center and landscape markets
- Consistent finish times — uniform across colors for simplified scheduling
Shop Vinca Valiant™ Seeds in Bulk
- Vinca Valiant™ Mix – 1,000 Bulk Seeds
- Vinca Valiant™ Apricot – 1,000 Bulk Seeds
- Vinca Valiant™ Burgundy – 1,000 Bulk Seeds
- Vinca Valiant™ Lilac – 1,000 Bulk Seeds
- Vinca Valiant™ Magenta – 1,000 Bulk Seeds
- Vinca Valiant™ Orchid – 1,000 Bulk Seeds
- Vinca Valiant™ Punch – 1,000 Bulk Seeds
- Vinca Valiant™ Pure White – 1,000 Bulk Seeds
How to Grow Vinca Blockbuster and Valiant™ from Bulk Seed
1. Sow Indoors 10–12 Weeks Before Last Frost
Both Blockbuster and Valiant™ require a long lead time from seed to transplant-ready plug. Start seeds indoors 10–12 weeks before your target outdoor planting date. For spring sales in most North American zones, this means sowing in January or February.
2. Germination: Darkness Required
Vinca seeds require darkness to germinate. Cover seeds lightly with fine vermiculite or germination mix — do not leave them exposed to light. Maintain a soil temperature of 75–80°F (24–27°C). Expect germination in 7–14 days under optimal conditions. Use bottom heat mats for consistent soil temperature across the germination bench.
3. Move to Bright Light Immediately After Germination
Once seedlings emerge, transfer trays immediately to high-intensity grow lights or a very bright greenhouse bench. Vinca seedlings stretch quickly in low light — 16 hours of supplemental light per day is recommended during the seedling stage. Maintain air temperatures of 70–75°F.
4. Transplant to Cell Packs or Plugs
Move seedlings to 128 or 72 cell packs once they have 2–3 true leaves. Feed with a balanced fertilizer at 100–150 ppm nitrogen. Allow the medium to dry slightly between irrigations — vinca is sensitive to overwatering and root rot in consistently wet conditions.
5. Pinch for Fuller Plants
For Blockbuster production in 4-inch or quart pots, pinch once when plants reach 3–4 inches to encourage branching and a fuller, more floriferous habit. Valiant™ branches naturally and may require less pinching in most production systems.
6. Finish and Install Outdoors
Harden off transplants over 7–10 days before outdoor installation. Plant after all frost danger has passed in full sun — minimum 6 hours of direct sun per day. Space Blockbuster 12–14 inches apart for landscape beds; Valiant™ can be spaced 10–12 inches for a tighter, more formal look. Both series thrive as temperatures rise through summer.
Blockbuster vs. Valiant™: Which Series Is Right for Your Program?
- Choose Blockbuster if you need maximum bloom size and high visual impact from a distance — ideal for large landscape beds, municipal installs, and retail displays where the "wow factor" drives sales
- Choose Valiant™ if you're in an extreme heat climate or targeting premium retail customers who want refined, sophisticated colors with guaranteed summer performance
- Run both for a complete vinca program — Blockbuster for high-impact landscape and retail, Valiant™ for premium container and upscale garden center production
Both series pair beautifully with other heat-season annuals in mixed production programs. For ideas on building a diverse summer annual lineup, see our post on growing bulk begonia seeds for bold summer color. For tropical accent plants that complement vinca in mixed landscape beds, check out our guide to growing Canna Tropical Yellow from bulk seeds.
Frequently Asked Questions: Vinca Blockbuster and Valiant™ Seeds
How big do Vinca Blockbuster flowers get?
Vinca Blockbuster produces some of the largest blooms in the vinca category — flowers can reach up to 2.5 inches across. This makes Blockbuster one of the most visually impactful vinca series available for retail displays and large landscape installs where bold color from a distance is the goal.
What makes Vinca Valiant™ different from other vinca series?
Vinca Valiant™ is specifically bred for extreme heat tolerance, making it one of the best-performing vinca series in hot summer climates and USDA zones 9–11. While most annuals slow down in peak summer heat, Valiant™ continues to produce flowers prolifically, making it a reliable choice for season-long landscape contracts in warm regions.
Do Vinca Blockbuster and Valiant™ seeds need light or darkness to germinate?
Both series require darkness to germinate. Cover seeds lightly with fine vermiculite or germination mix and maintain a soil temperature of 75–80°F. Do not leave seeds exposed to light during germination — this is a common mistake that reduces germination rates.
How long does it take Vinca Blockbuster and Valiant™ to bloom from seed?
Expect first blooms approximately 12–16 weeks from sowing under optimal conditions. Starting seeds 10–12 weeks before your last frost date will give you blooming or near-blooming transplants ready for spring sales or landscape installation.
Can Vinca Blockbuster and Valiant™ grow in full sun?
Yes — both series thrive in full sun and are among the most heat and sun tolerant annuals available. A minimum of 6 hours of direct sun per day is recommended. Performance improves as summer temperatures rise, making both series ideal for hot, sunny locations where other annuals fade.
How many seeds are in a bulk pack?
Each bulk pack contains 1,000 seeds, sized for commercial flat production, landscape contractors, and large-scale growers. For smaller retail quantities, visit www.trailingpetunia.com.
What is the best vinca for extreme heat climates?
For extreme heat climates — particularly the Southeast, Southwest, and Gulf Coast regions — Vinca Valiant™ is the top recommendation. It was specifically bred for heat performance and consistently outperforms standard vinca varieties in high-temperature environments. Vinca Blockbuster is also an excellent heat performer and adds the benefit of exceptionally large blooms.
Are Vinca Blockbuster and Valiant™ F1 hybrids?
Yes. Both Blockbuster and Valiant™ are F1 hybrid vinca varieties. Saved seeds will not produce plants true to the parent variety. For consistent color, bloom size, and heat performance, purchase fresh bulk seed each season.