• A greenhouse allows you to grow plants that are normally difficult to grow in outdoor conditions.greenhouse image by Paulo Ribeiro from Fotolia.com
  
  Growing plants in a greenhouse is a beneficial gardening method for delicate-plant collectors or for those who live in areas where the weather doesn't allow year-round crops. In a greenhouse, you can control the environment of your plants and the way that they grow. While most plants grow successfully in a greenhouse, certain plant seeds (particularly jungle varieties) with special needs do best there.
  
  

Orchids

• As one of the most coveted, rare and delicate flowers in the plant world, orchids thrive in a controlled environment such as that of a greenhouse. When planted in humidity trays, orchid seeds are ideal for germination in a greenhouse. Pick tropical orchids so your payoff is large, brightly colored flowers. Popular seed varieties for a greenhouse include the cattleya and the phalaenopsis.
  
  

Ferns

• Since greenhouses can provide a humid, temperature-controlled environment with lighting tailored to plants' needs, tropical ferns are one of the best plants to grow there from seeds. Ferns are also known as good houseplants after being grown in a greenhouse, since they prefer low lighting. When growing ferns in a greenhouse, they must be misted on a daily basis. Choose a range of sizes from large to small, along with a plethora of colors such as white-green to black-green. Popular greenhouse fern types include maidenhair, button, crocodile, crested bear's paw and staghorn. The range of textures is endless, and choosing your favorite is part of the fun.
  
  

Begonias

• Begonias can take their time growing from seed to maturity, but this South American and Asian plant grows large, bright flowers that have a bold, sweet smell. The varieties you can choose from are vast, with small to large foliage. Begonias are best started in partial light and then moved to shade once full-grown. A popular begonia variety to grow from seed in a greenhouse is the wax begonia, whose flowers come in white, yellow, red, pink and orange. These seeds are extremely tiny and are best started in humidity trays with constant moisture, a method called hydroponics, which uses only water and a nutrient solution (and no soil) to raise plants.