Trachelium Lake Michigan Purple Seeds

Grow tall, cloud-like purple filler flowers for bouquets and borders. Trachelium Lake Michigan Purple produces a large central umbel with smaller satellite umbels on sturdy upright stems.

Ready to grow your own purple cut stems? Follow our step-by-step Trachelium Lake Michigan Purple Grow Guide for pelleted-seed sowing, germination, transplanting, support, regional timing and harvest advice.

Quick Grow Facts

• Scientific name: Trachelium caeruleum
• Series and colour: Lake Michigan Purple
• Plant type: Tender perennial commonly scheduled as a cut-flower crop
• Seed form: Pelleted; sow each pellet intact
• Pretreatment: None; do not soak, chill, scarify, crush or peel the pellet
• Sow depth: Surface sow and do not cover
• Germination light: Optional; provide bright light after emergence
• Germination temperature: 17–21°C
• Germination time: 5–7 days under controlled breeder conditions; allow the current packet's 15–21-day home window
• Best method: One pellet per clean cell; tray sowing preferred
• Position: Sun to partial sun; protect new plants from severe heat
• Garden spacing: 25 cm
• Cut-row density: About 65 plants/m² unpinched or 24 plants/m² pinched
• Growth form: Upright cut-flower filler, about 76–107 cm; support recommended
• Flowering: Obligate long-day crop; dependable professional flowering uses a 16-hour day
• Planning window: 7–9 weeks in plugs plus about 10–18 weeks to finish; current packet planning point 22 weeks from sowing
• Harvest: Cut when half or more of the small florets are open

Pellet Moisture Matters

Place the pellet on pre-moistened fine seedling mix, wet it thoroughly and keep the surface evenly moist until the coating softens and germination starts. A hard dry pellet cannot release the seed; a saturated airless tray encourages damping-off.

Growing and Cutting Notes

Transplant rooted plugs after about 7–9 weeks and harden them for 7–10 days. Use fertile, loose, well-drained soil, steady root-zone moisture, moderate feeding and good airflow. Install support netting early. Pinching is optional; pinch 2–3 weeks after planting only when using the wider 24-plants/m² system and allowing extra crop time.

The current packet image says 1 mm deep and “All Year”, while the named Lake Series breeder says no cover and requires long days. Follow the guide's regional timing instead of treating the packet calendar as a national promise.

Ornamental seed: Do not eat seed, pellets, seedlings or plant parts. Pelleted describes seed form and does not confirm treatment status; follow the delivered lot warning.

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