Cover them lightly with about 1/4 inch (.64 cm) of garden soil. You may be moving a large flowering shrub, a seedling tomato or a zinnia that you've planted from seed but the procedure that you follow is similar for all. Save any seeds for the following year, or allow volunteer seedlings to sprout. Sowing in spring is the typical time for calendula seed propagation, but you can do it again in the summer to get more fall blooms. Watch for signs of germination 10 to 14 days after sowing the calendula seeds. They also didn’t mind the shock of transplanting–I had no losses. The Rundown on Calendula: You may not see many seedlings emerge if it’s cooler or warmer than this. Plant seeds about 1/4 to 1/2 inch (.64 to 1.27 cm) deep and 4 to 6 (10.16 to 15.24 cm) apart. Calendula seeds germinate best at between 15-25C (59-77F). Make sure you cover the seeds with soil to a depth of about one-quarter to one-half inch (0.5 to 1.5 cm.). This helps you to: Prevent transplant shock; Avoid having leggy starts; Save indoor space for other plants; If you are planting calendula outdoors, you can plant your seeds … In Zones 5 to 6, plant seeds outside after the soil warms to 60° In Zones 7 to 10, sow seeds outdoors in fall, where they are to grow. If possible, transplant on a warm, overcast day in the early morning. This worked very well. Transplanting your seedlings Transplanting plants to your garden from inside or from one place to another is often a tricky proposition. Dividing & Transplanting: Calendula will not easily divide. Best to sow the seeds in place and allow plants … Soak the soil around new seedlings immediately after transplanting in order to settle the roots. Calendula seedlings unfurling from curved seeds. Calendula isn’t particularly pest-prone, but some things will munch on it, particularly when it’s small. Most growers should start plants by direct sowing outdoors. Plant the curled seeds in your garden from early spring onward, or start them indoors and set out the sturdy seedlings. Transplanting the seedlings when they were larger may have given them the oomph to withstand attacks. To grow calendula from seeds follow these points very carefully: Outdoor planting time: In Zone 5 or colder, transplant calendula seedlings to the garden a week or two before the last spring frost. Plant calendula seeds in the spring after the last frost in your area. Allow some plants to produce mature seeds to scatter where you want to see calendula seedlings in subsequent seasons. Single Plants: 11" (30cm) each way (minimum) Rows: 9" (25cm) with 1' 11" (60cm) row gap (minimum) Sow and Plant. This gives the plants a chance to settle into the soil without being instantly exposed to the intense midday sun. You can grow calendulas directly from healthy and disease resistant seeds purchased from the nearest seed house, or you can purchase healthy seedlings from the nearest plant nursery and transplant them in your garden to make it more beautiful. If the soil is warm enough and the seedlings are mature enough to be transplanted, harden them off and get them outside in the sun to keep them from growing leggier. Once a hard frost kills the plants naturally, remove the whole plant, pulling up the roots and bring to the compost pile. Calendula grows quickly from seed. Solution #6: Transplant the seedlings outside as soon as conditions are ideal. The second important factor to note when planting calendula seeds is that light will disrupt germination.