How to Germinate Celery Indoors

Celery requires a long growing season. When you plan to grow celery in the garden, you need to germinate the seeds before the frost ends. Celery seeds are usually started in mid-February to give the seeds plenty of time to germinate. The celery seeds require warm soil temperatures, so the seed-starting containers need to be monitored carefully. Once the celery seeds germinate, you can transplant the seedlings outdoors after the threat of frost passes.

Divided seed-starting containers
Soilless seed starting mixture
Spray bottle
Vermiculite
Grow lights

Instructions

- 1
  Fill divided seed-starting containers with a soilless seed-starting mixture.
- 2
  Place the seed-starting containers onto a tray.
- 3
  Water the soil with a spray bottle to moisten it. Add more soil to the containers if it settles so that the containers remain full.
- 4
  Start the celery seeds 12 weeks before the growing season. Follow the celery seed packet instructions for planting directions. If you do not have directions, sprinkle a pinch of the small seeds into each growing container cell.
- 5
  Cover the celery seeds with a light layer of vermiculite. Water the soil daily so that it does not completely dry out.
- 6
  Place the containers in a location away from drafts and direct heat. The seeds need a temperature of 60 degrees Fahrenheit to germinate.
- 7
  Hang grow lights 2 to 4 inches above the celery seedlings. Keep the lights on the containers for 12 to 16 hours a day until you transplant them outdoors.
- 8
  Prepare the celery seedlings for germination when the frost ends and the seedlings are 8 centimeters tall.

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