Duration Photoperiod

Most plants grow best when exposed to 16-18 hrs of light per day. Additional hours of light during the day have not been found to increase growth by any significant amount. Plants that exhibit photoperiodism, the trait that causes day length to trigger flowering, should be exposed to 12-14 hours of light once flowering is desired. Total darkness is required during the darkness

Growing Mini Sweet Peppers Indoors
This indoor aeroponic garden flourishes under the light emitted from a 400W Metal Halide lamp. Shown growing Sweet Basil, Thai Pepper, Sage, Fernleaf Dill and Lemon Balm.
Sage Aeroponic
When lighting an indoor garden it is of particular value to establish an evenly lit area. A portable light meter can be of great help in this regard.
What Photoperiodism Plants

On the left is a Metal Halide lamp, notice the white/blue hue. The lamp on the right is a High Pressure Sodium and exhibits a warmer, yellow/ orange hue.

cycle for flowers and fruit to form correctly. Select a timer to control the duration of HID light. Some popular plants that are frequently grown indoors and exhibit "photoperiodism are Chrysanthemums, Poinsettias, Bromeliads, Pansies, Gibsofilia, Fuschi, Petunia, Gladiolia and Roses. These plants will flower when their photoperiod is 12hrs. of light and 12hrs. of darkness. Using indoor lights and a timer, you can force flower them during market peaks to increase yields and provide on-time delivery.

On the left is a Metal Halide lamp, notice the white/blue hue. The lamp on the right is a High Pressure Sodium and exhibits a warmer, yellow/ orange hue.

Single Truss Tomato Production

Tomatoes in the middle of winter made possible with the hydroponic method and a little artificial light. These six Matusalah variety tomato plants yielded 39 handball sized fruit, adding up to almost 8 pounds of tomatoes! Not bad for a spare closet! The plants were grown under a 400W MH lamp until they set their first truss of fruit. At that point, the lamp was changed to a high pressure sodium conversion and all growing tips were pruned to prevent the plants from outgrowing the space. I learned of this method (called STTP for Single Truss Tomato Production) at the Rutgers University website, however, in checking back recently it seems to have been removed. Do a Google search for more info!

Tomatoes in the middle of winter made possible with the hydroponic method and a little artificial light. These six Matusalah variety tomato plants yielded 39 handball sized fruit, adding up to almost 8 pounds of tomatoes! Not bad for a spare closet! The plants were grown under a 400W MH lamp until they set their first truss of fruit. At that point, the lamp was changed to a high pressure sodium conversion and all growing tips were pruned to prevent the plants from outgrowing the space. I learned of this method (called STTP for Single Truss Tomato Production) at the Rutgers University website, however, in checking back recently it seems to have been removed. Do a Google search for more info!

Growing Soilless

Growing Soilless

This is an easy-to-follow, step-by-step guide to growing organic, healthy vegetable, herbs and house plants without soil. Clearly illustrated with black and white line drawings, the book covers every aspect of home hydroponic gardening.

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Responses

  • oona
    Is sage a photoperiod plants?
    5 years ago
  • Jens
    How to grow sweet basil?
    5 years ago
  • esa-pekka vanhanen
    Are roses photoperiod or light duration flowering plants UF?
    4 years ago

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