How to Grow Bulbs Under Grow Lights


Hardy bulbs, like tulips, daffodils and crocus, and tender bulbs, such as the calla lily and amaryllis, are beautiful flowers. You can grow bulbs indoors with grow lights for a lovely splash of color several times a year. Hardy bulbs must be forced in order to grow and flower indoors, but that is easily done. Tender bulbs do not need to be forced to grow, but they do need plenty of light in most cases.

Step 1

Fill the containers with soil about halfway. Place hardy bulbs and tender bulbs in different containers. Place as many bulbs in each container as will fit without touching. Leave a space, about ¼ to ½ inch, from the edges of the container to the bulbs. Place soil on top of the bulbs, but leave the pointed tips above the surface of the soil.

Step 2

Water the bulbs until the soil is moist.

Step 3

Place the hardy bulbs in a cold place with temperatures between 35 and 48 degrees F. Leave them there for about 3 months.

Step 4

Place the tender bulbs under the grow lights.

Step 5

Water the tender bulbs once growth appears. Allow the tender bulbs' soil to dry out before each watering.

Step 6

Place the hardy bulbs in a cool place, about 50 to 60 degrees F, until growth appears. Water the bulbs until the soil is moist and place the hardy bulbs near the grow lights, but not directly under them. They will flower faster this way. Discard the hardy bulbs after flowering.

Tips and Warnings

  • Allow tender bulbs a period of rest, about 2 months a year, in a dark room with no water, to get the best flowers from them.

Things You'll Need

  • Containers
  • Potting soil


  • University of Minnesota: Forcing Bulbs for Indoor Beauty in Winter

Who Can Help

  • Savvy Gardener: Forcing Bulbs Indoors
Keywords: grow bulbs indoors with grow lights, tender bulbs, hardy bulbs

About this Author

Hollan Johnson is a freelance writer for many online publications including Garden Guides and eHow. She is also a contributing editor for Brighthub. She has been writing freelance for over a year and her focus' are travel, gardening, sewing, and Mac computers. Prior to freelance writing, Hollan taught English in Japan. She has a B.A. in linguistics from the University of Las Vegas, Nevada.