Profit-makers under lights

Whether you are using the greenhouse or are growing plants in a special room or area in the home, regular attention is essential to success with artificially lighted plants just as with sun-lighted plants. Try to keep daytime temperatures between 70 and 75 degrees with the usual 10 degree drop during the night. Increase humidity by setting the pots on moistened pea rock. Grow the plants in sterilized soil. Water them regularly, according to the needs of each plant. Spray plants with insecticide every second week, as a preventive. As plants grow, shift them to the next larger sized pot. Leave the lights on flowering plants 12 to 16 hours each day; 4 to 8 hours per day for foliage plants.

If the plants produce long willowy foliage, they are too far from the lights. Set them on boxes or inverted flower pots to boost them closer. If leaves turn yellow and hug the pot, plants are probably getting too much light. Move them farther from the lights.

With stationary fixtures, aim for 18 inches between light tube and plant table to allow head room for plants in 4-inch pots. If you grow larger plants, fasten the lights a greater distance from the table or, better still, operate them on a pulley so you can regulate distances to suit plants.

As you experiment, you will find the proper distances. Here ‘ is a rather general rule to guide you. Light-loving plants, such as gloxinias and many other tuberous gesneriads, cacti, coleus, and wax begonias grow best with about 8 inches between light fixture and pot rim. African violets, rex begonias, and episcias, among others, thrive when space is about 11 inches. Foliage plants, philodendron, ivy, and cissus can be set 18 to 24 inches from

the source of light.

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