Are Orchids Harmful to Houseplants?

Potting Medium

• The potting medium for orchids differs from the type used for houseplants. Orchids are epiphytes, plants that use another plant for structure but do not feed on it. They grow best in potting soil that holds their roots in place, such as chipped fir bark or coconut fiber. Houseplants derive nutrients from potting soil, but orchids rely more on regular fertilizer feedings. Watering techniques differ for orchids because of their porous potting medium.

Watering

• Houseplants may be harmed if they are watered as frequently as orchids. Houseplants are watered when their soil is dry to the touch, which may be once a week. Orchids should be kept "evenly moist," according to the American Orchid Society. Orchids in warm homes with low humidity require more frequent watering. Place orchid plants on a tray of pebbles to ensure that they do not sit in water.

Light

• Orchids and many houseplants do best in a south- or east-facing window that provides light without direct sun. West-facing windows are hot in the afternoon and may burn leaves. North-facing windows are beneficial for houseplants that need little light, but not for orchids. Dark green leaves on a houseplant indicate adequate nutrients and good health. Orchid leaves should be light or medium green with yellowish undertones.

Fertilizing

• Houseplants are fertilized once every one to three months from March to September. Orchids require a diluted fertilizer feeding once a week. Orchids do better with too little fertilizer than too much. A balanced fertilizer with equal proportions of nitrogen, phosphorus and potassium is recommended for both orchids and houseplants. Diluted fish emulsion fertilizer provides the additional micronutrients that orchids and houseplants need to grow and thrive.