Cosmos ( Cosmos bipinnatus ) is an annual plant native to Mexico, typically reaching between 60 and 120 cm in height. It is prized for its delicate flowers in a variety of shades, ranging from white to pink to purple, which add an airy and colorful touch to summer gardens.
2. Sowing
- Difficulty level : Easy
- Type of sowing : Direct in open ground after the last frost (end of May in zone 5-6) or indoors 4 to 6 weeks before the last frost (beginning of April)
- Sowing technique : Sow the seeds on the surface of the soil and cover them lightly with potting soil.
- Sowing depth : Approximately 0.5 cm
- Germination days : 7 to 14 days
- Germination temperature : 18 to 21C
3. Culture
- Ease of cultivation : Easy
- Growing season : Spring to fall
- Transplanting : If sown indoors, transplant after all risk of frost (early June in zone 5-6)
- Plant spacing : 30 to 45 cm between plants
- Hardiness Zone : Annual, not hardy
- Brightness : Full sun
- Soil Type : Light, well-drained
- Soil pH : Neutral to slightly alkaline
- Soil Moisture : Moderate, drought tolerant once established
- Soil fertility : Not very demanding
- Time to Flower : Approximately 8 to 10 weeks after sowing
- Watering : Regular at first, then moderate
- Other features : Attracts pollinators and butterflies, ideal for flowerbeds and bouquets
4. Use
Cosmos is perfect for adding height and lightness to flower beds. Its cut flowers are also highly valued in floral arrangements for their beauty and longevity.
5. Companionship
- Friendly plants : Zinnias, marigolds, lavender
- Enemy plants : None known
This variety is well adapted to Quebec climates and is an excellent choice for gardeners wishing to enrich their garden with flowers that are easy to grow and attractive to pollinating wildlife.
