How to Start a Flower Seed Indoors


There are several annual and perennial flowers that may be grown successfully from seeds starting inside. The majority of flower and wildflower seeds for containers may be started indoors six to eight weeks before the planting date that is indicated on the seed packaging. The seed package also includes any additional information that may be necessary to promote the proper germination and early development of the seed. When should flower seeds be planted for later transplantation outside in the spring? The answer to this question varies based on the growth season of the flower, the climate of your location, and the amount of time it takes for the seed to germinate and develop into a robust seedling.

  1. 1. Prepare the Pots

    According to the recommendations of Master Gardener Steve Albert, sterilised potting soil should be used to fill seedling pots measuring 3 inches in diameter. Flower seeds may also be started inside in egg cartons or other containers made of biodegradable material.

  2. 2. Wet the Potting Mix

    A plant tray should have an inch’s worth of water added to it. Place the pots on the tray and wait for the water to be absorbed by the pots via the drainage holes at the bottom of the pots for around half an hour, since this is the average amount of time required. Remove any surplus liquid that may be present in the tray.

  3. 3. Sow the Seeds

    Plant two flower seeds on the surface of the soil in each individual container. The seeds should be buried in the soil to the depth that is specified on the seed package. The vast majority of seeds have to be buried to a depth that is twice as wide as they are, however some types of flowers can need light to germinate, therefore they shouldn’t be covered with dirt.

  4. 4. Cover the Tray

    Put the whole tray into a bag made of transparent plastic or cover it with plastic wrap and slide it into the bag. When the bag is sealed, the soil won’t be able to dry up throughout the germination process; as a result, the seeds won’t need to be watered until after they have sprouted.

  5. 5. Place in a Warm Location

    Place the tray in a warm location, since the majority of flower seeds will not germinate at temperatures below 70 degrees Fahrenheit or over 75 degrees Fahrenheit. The University of Minnesota Extension recommends using the use of a seed heat pad in order to provide bottom heat to the containers. If the seed packaging indicates that the variety must be exposed to light in order to germinate, choose a well-lit position that is shielded from direct sunlight; otherwise, a dark place will do just fine.

  6. 6. Monitor the Pots

    Always keep a close eye on the pots, and as soon as you see the first sprouts, take off the plastic bag. Transfer the tray to a location that is exposed to sunlight for a minimum of six hours each day.

  7. 7. Water the Seedlings

    When the dirt on the surface of the pots feels dry to the touch, it is time to water the seedlings. If you allow the soil to get too dry, the seedlings will perish.

  8. 8. Thin Excess Seedlings

    Once the seedlings in each pot have developed their second set of leaves, the smaller seedling should be pinched off so that just one flower will grow in each pot. You may also use scissors that have had their blades sanitised by immersing them in Lysol in order to cut extra seedlings.

  9. 9. Fertilize at Two Weeks

    According to the North Carolina Cooperative Extension, the seedlings should be fertilised. The majority of flower seedlings would benefit from the use of a soluble fertiliser that is administered at a rate that is one-half of what is indicated on the product packaging. When the seedlings are two weeks old, you may begin fertilising them, and you should continue to apply the diluted fertiliser solution every two weeks until you transplant them.

  10. 10. Transplant the Seedlings

    When the seedlings have reached the age of six to eight weeks and the temperature has reached at least the minimum level that is suggested on the packaging, you should transplant them outside.

    Things You Will Need

    • Seedling pots

    • Seedling tray

    • Seed-starting mix

    • Seed heat mat (optional)

    • Plastic bags or plastic wrap

    • Water soluble or liquid fertilizer for flowers