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Cockscomb Germination

Cockscombs (Celosia spp.) add long-lasting color and texture to summer flower beds with their velvety flower spikes and tinted foliage. Although often grown as annuals, cockscombs grow as tender perennials in U.S. Department of Agriculture plant hardiness zones 10 through 11. Cockscomb seeds germinate reliably and the seedlings will grow quickly. You need to sow the seeds at the right time and under the correct conditions to ensure success.
  1. Timing

    • Cockscombs originated in the tropics, so they rely on warm, consistent temperatures for healthy growth. Starting the seeds indoors roughly four to six weeks before the last anticipated frost will give the seedlings a head start on development, which will help ensure abundant blooming later.

    Equipment Preparation

    • You don't need any special equipment to germinate cockscomb seeds, although the seedlings are more likely to survive if they are grown in biodegradable pots that can be planted whole without disturbing the seedlings' roots. Sterile medium such as seed-starting compost or a homemade mixture of equal parts sand, perlite and peat should be used because it will help prevent fungal or bacterial problems. In cooler areas, you may need a propagation mat to keep the seeds at the right temperature, although it is not necessary in most homes.

    Sowing

    • Cockscomb seeds need darkness during their germination process, so they must be sown roughly 1/4 inch deep in a biodegradable pot filled with the sterile medium. Sow one or two seeds in each pot, leaving 1/2 inch between each one. Using a spray bottle or atomizer, mist the medium heavily to settle it onto the seeds, then cover each pot with plastic wrap to maintain constant humidity and warmth around the seeds while they germinate.

    Germination

    • Temperature consistency, moderate moisture and darkness are the three key elements to successfully germinating cockscomb seeds. Place the pots where temperatures are consistent and stay between 65 and 75 degrees Fahrenheit, such as in a warm room or on top of the refrigerator. If the house or room stays colder or has fluctuating temperatures, warm the pots with a propagation mat. Remove the plastic wrap for 30 minutes each day, and maintain a moderate level of moisture in the top 1/2 inch of the medium. Viable cockscomb seeds will sprout in roughly two to three weeks.

    Care and Planting

    • As with most seedlings, cockscombs must be hardened off for one to two weeks before planting them in the garden to prevent transplant shock. A sheltered patio, porch or a lightly shaded south-facing wall provide the right conditions to harden the seedlings. Thin out the cockscomb seedlings to one per pot, if both seeds sprout. Keep them watered, but allow the top 1 inch of soil to dry out between waterings. Plant them in a sunny bed once nighttime temperatures stay reliably above 45 degrees Fahrenheit.