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How to Use Grow Lights for Seedlings (Beginner’s Guide)

Written By: Benjamin Kilbride Gardening Contributor

If you want to ensure rapid growth of your vegetable seeds indoors, then using grow lights can make all the difference. Get advice on which plants benefit from starting indoors and how to use grow lights.

If you are planting seeds indoors, then your seedlings must have strong light once the first leaves have emerged. Otherwise, they will get leggy and weak, a sure sign they are not getting enough light.

If you have ever grown seeds on a not-so-sunny windowsill or too early in the season, then you have seen how seedlings get tall and spindly and sometimes flop over. In many areas, the winter sun is simply too weak to provide enough natural light. 

Grow lights provides strong light to start healthy, vigorous, fast-growing plants. They provide light from directly above which promotes strong, upright growth. This is different than a windowsill where light is from the side. 

There are many different grow lights on the market. See our post on what kind of grow light to buy.

Signs Your Seedlings Need More Light

  • Tall, thin stems
  • Leaning toward window
  • Pale leaves
  • Slow growth

Vegetables for Grow Lights

Best Vegetables to Start Under Grow Lights

Many vegetable seedings are perfect for starting indoors. Here are our favorites:

  • tomatoes
  • peppers
  • cauliflower
  • chili peppers
  • squashes
  • broccoli
  • melons

Many of these vegetables require a long growing season so starting them under grow lights will give them a nice head start.

What NOT to Start Indoors

Some crops should not be started indoors—such as root vegetables (which do well outside in the cold, anyways). 

  • Carrots
  • Radishes
  • Beets
  • Turnips

How to Use Grow Lights

Watch our video demonstration above to see how to use your grow lights! We’ll discuss placement, timing, and set-up details.

Try the Garden Planner

After you watch this video, check out our Garden Planner if you want to plan a spring garden! We are offering more free videos plus a a free 7-day trial of the Almanac Garden Planner.

About The Author

Benjamin Kilbride

Benjamin Kilbride

Gardening Contributor

Benjamin Kilbride has been an editorial contributor for The Old Farmer’s Almanac. While he doesn’t own any land, he gets creative with gardening every year in pots, in small mobile greenhouses, and un...

Read more from Benjamin Kilbride