Planting Carnation Seeds Indoors

Six to eight weeks before your area will be frost-free, you can start your carnation seeds indoors. Learning how to grow carnation flowers this way is easy and will promote flowering in the first year so you can enjoy the fruits of your labor by taking care of carnations. Choose a container with drainage holes in it, filling the container within an inch or two (2.5 to 5 cm.) from the top with potting soil. Sprinkle the seeds across the top of the soil and cover them lightly.

Water until the soil is moist and then wrap the container in a clear plastic bag to create a greenhouse effect. The beginnings of your carnation garden plants should poke through the soil in two to three days. Move the seedlings to their own pots once they have two to three leaves, and transplant them outdoors once they reach a height of 4 to 5 inches (10 to 12.5 cm.) and your area is free of frost risk.



Planting Carnation Seeds Outdoors

Some people would rather learn how to grow carnation flowers outdoors after the threat of frost has passed. Learning how to plant and take care of carnations in an outdoor garden is similar to growing carnations indoors, but it’s unlikely that your plants will bloom the first year when the seeds are sown outdoors. Begin planting carnation seeds outdoors by sowing them in 1/8-inch (3 ml.) deep soil that will drain well. Keep the soil in your garden, or container, moist until the seedlings are growing. Once your seedlings are thriving, thin them so the small plants are 10 to 12 inches (25 to 30 cm.) apart.