Growth Habits

• Most of the 25,000 species of orchids grow in one of two ways. Epiphytic orchids grow on tree branches, but they do nothing to diminish the tree's nutrients, nor harm it in any way. The orchids produce roots that keep it anchored to the tree, but they do not draw their nutrients from it. Epiphytic orchids feed on decayed plant and animal matter, which develops around their root systems. Moth orchids (Phalaenopsis) are epiphytic orchids. Terrestrial orchids grow on the ground, and they are far more common than epiphytic orchids. Like many ground-dwelling plants, terrestrial orchids draw in nutrients through their roots, which grow downward into the soil.
  
  

Cultivation

• Orchids grow best in well-drained, well-aerated soil that is loose but very rich in nutrients. Moss and bark chips make for an ideal medium with which to grow orchid flowers. Most orchids prefer a humid environment with moist air. Place potted orchids on top of a gravel- and water-filled tray to provide the moisture the flowers need. Orchids also need air circulation, both in the soil and around them as they grow. Do not plant flowers too closely together.
  
  

Growing Conditions

• When orchids are receiving enough water and light, they are relatively low-maintenance plants. But the flowers are sensitive to temperature and light conditions; flowering will be prevented if orchids are receiving too much or not enough. Most orchids grow in sub-tropical and tropical-environments and are very intolerant of frost. Protect outdoor orchids with clear plastic to insulate them against the cold if freezing temperatures are predicted. Do not allow orchid soil to become too moist. Add water only when the soil is dry to the touch and then only enough to moisten the medium.
  
  

Appearance

• Orchid flowers grow in many different shades of orange, yellow, purple, pink, white, red and green. The small, five-petaled blossoms grow along long, thin flowering stems, usually on both sides. The flowers may be variegated in many color and pattern combinations. Bright green foliage grows around the lower portion of the stem, the upper half of the stems usually being dominated by flowers.