Long-Day Plants

Long-day plants, as a rule, need 14 or more hours of light per day to develop good flowers. In winter when days are short, give these plants 4 to 6 hours of added light. We have several pages of greenhouse lights on this site.  Read the product exerpts and reviews to make the most informed decision before you buy. Think about how you are going to mount these lights.  If they will be able to hand down close to the plants, you will be buying a different kind that if they have to be mounted much higher up.  Remember that you may have mist propagation lines going off.  If that is the case, your lights will need to be up well above the mist.

Sixty to 75-watt incandescent, as many as needed, are spaced 3 feet apart and hung about 4 feet above the plants. They will supply the right amount of light.

Asters, dahlias, delphinium, feverfew, some varieties of iris, marigold, pansy, stock, and tuberous begonias are some of the plants which respond favorably to artificial day lengthening.