Seasonal Vegetables

• During the spring, summer and early fall, vegetables like strawberries, squash, tomatoes, cucumbers and other summer vegetables grow well in greenhouses. However, vegetables that are sensitive to lower temperatures will not grow as well in a greenhouse over the winter when temperatures are lower. Heated greenhouses make it easier to grow some vegetables, but choosing cold-tolerant plants like spinach, beets and turnips makes it easier and less expensive to grow vegetables during the winter.
  
  

Soil Condition

• Choosing the right type of soil for vegetables in a greenhouse is as important as making sure the garden soil is healthy. Greenhouse soil does not have access to the worms and organic matter that replenishes the nutrients of garden soil, which makes it important for gardeners to add fertilizers to the greenhouse growing tables regularly. Healthy soil contributes to the production of healthy vegetables; a nutrient deficiency will weaken the plants over time.
  
  

Greenhouse Care

• Keeping the greenhouse in working order is important. Greenhouse insulation is one way to raise the temperature of the greenhouse during all seasons of the year without adding a central heating system. Clean the greenhouse each spring to remove any fungi from the windows, floor and greenhouse staging, and keep the vegetable plants healthy. Monitor the temperature and humidity of the greenhouse, and ventilate or heat it as necessary to keep the growing conditions stable.
  
  

Pest Problems

• Even in greenhouses, vegetables are susceptible to pest problems. Whiteflies are small white insects that look like moths but are more closely related to aphids. These pests suck nutrients from the leaves of vegetables and weaken them, leading to a smaller harvest. Whiteflies feed on the undersides of leaves, which makes detection more difficult. Check the greenhouse for pests regularly, and apply pesticides designed for greenhouse use to control the damage done by whiteflies.