How to Plant Seeds for Containers in a Greenhouse

Greenhouses extend the growing season, especially in colder climates, by giving your plants a protected area to grow. Many gardeners start seeds in a greenhouse so their transplants are ready once the weather warms up or to grow container plants. This is especially helpful for northern areas with short growing seasons. For the seeds to germinate, your greenhouse must be warm enough, at least 72 to 76 degrees Fahrenheit.

Seed trays
Potting soil
Spray bottle

Instructions

- 1
  Adjust the temperature on your greenhouse so it is at least 72 F. If you have a passive solar greenhouse wait until the temperature inside is that warm. It will usually be when the outside temperature is between 42 F and 52 F.
- 2
  Fill the seed trays with potting soil. Press the seeds into the seed trays. Cover larger seeds with ¼ to ½ inch of soil.
- 3
  Spray the soil with a water-filled spray bottle to keep the planting medium moist. Place the seed trays in the area of your greenhouse that gets bright sun daily.
- 4
  Keep the humidity in your greenhouse at 50 to 60 percent when the seeds are germinating. Move the seed trays into the middle of the greenhouse at night to keep them warmer.
- 5
  Transplant the seedlings to larger containers when they are 3 to 5 inches tall.

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