Successful greenhouse growing can be a difficult thing to master, but there are several tips that may help. Plants grown in a greenhouse typically have longer growing seasons which permit seeds to be planted sooner. Greenhouse growing requires adequate ventilation during warm weather to prevent mold from forming. A greenhouse must also be sturdy enough to support snow accumulations during the winter. Soil used for greenhouse growing should be replaced, periodically and careful watering procedures must also be followed.
Greenhouse growing provides a controlled temperature range that lengthens the growing season of most plants. In the U.S., hardiness zones have been established for different climates. Greenhouse plants typically fall into a warmer hardiness zone than those grown outside. A warmer hardiness zone allows seeds to be planted sooner than normal. Fruit-bearing plants may also continue past their natural season under these controlled conditions.
The moist environment of a greenhouse can promote the growth of mold during the warm summer months. A ventilation system is typically required for both moisture and temperature control. Roof or wall vents can be installed at each end of the structure to allow natural breezes to carry away excess moisture and heat. Exhaust fans may also be utilized when the wind is calm. In warmer climates, a thermostat-controlled ventilation system may be needed.
Precautions must also be taken to keep plants safe during the winter months. A greenhouse typically provides very little insulation, and the air inside must be kept warm during freezing temperatures. A fan-forced heater with a thermostat control may be needed to keep the inside temperature at a constant level. Greenhouses located in areas of frequent snowfall should be reinforced with sturdy lumber. This will prevent the roof from collapsing under heavy snow accumulations.
Greenhouse growing soil is often reused until it becomes depleted of necessary nutrients. If soil is to be reused, a sample should be tested annually to determine the need for any supplemental nutrients. If testing is not possible, a small amount of nitrogen must be added before any new planting begins. Greenhouse soil should be periodically replaced for best results.
Successful greenhouse growing typically requires a careful watering routine. Plants should be lightly sprinkled at the beginning or end of the day. Allow the soil to dry slightly between each watering. Move back and forth along the line of plants until the water trickles out of the planter bottoms. Use less water during cold weather to prevent excess moisture from building up in the greenhouse.
