For those with green thumbs, vegetables often thrive and provide extensive harvests in summer and fall or winter and spring, depending on their season. All vegetable plants require plenty of sun and a set degree of warmth, and this makes them difficult in areas that get cooler summers or harsh winters. In these situations, it's a good idea to put the vegetables in greenhouses to control the temperature and lighting of the environment.
Ready the greenhouse before planting your vegetables. Make sure you have a working fan and heater to warm and circulate the air, as well as a thermometer to monitor the greenhouse's temperature. Check all the lights in the greenhouse and replace burned out bulbs.
Plant the vegetables in the greenhouse where they will get full sun, or plant seedlings in pots and growing trays with drainage holes so that they can be moved into a sunny location. Amend the soil with half compost and half quick-draining soil to a depth of 1 foot, or fill the pots with this mixture. Plant vegetable seedlings per their preferred depths.
Place potted vegetable plants in sunny areas of the greenhouse. Move them as necessary so that they get six to eight hours of sun daily. If you're growing in winter, use the lights in the greenhouse to supplement natural sunlight and accomplish this length of exposure.
Give the plants 2 inches of water every week. Maintain humidity in the greenhouse by spraying the plants with a garden hose every time they are watered. Monitor the temperature in the greenhouse, and use fans and heaters to maintain temperatures of 70 to 80 degrees Fahrenheit. Increase the frequency of watering when you're using the fan or heater, as these will dry out the plants.