Light and Temperature
Best flowering generally occurs under higher light intensities of longer duration that leads to the accumulation of food reserves needed for flowering. Cooler temperatures at night, when respiration continues while photosynthesis... read entire article
Air Pollution, Air Movement, and Humidity
Potted orchid roots require oxygen derived from the air pockets or well-aerated water present in a porous medium, because the uptake of water and nutrients (in addition to root maintenance and growth) is a process which demands energy... read entire article
Watering
Most orchids, particularly the epiphytes, have evolved to withstand dry conditions to some extent. Unlike other more tender plants, orchids don't usually cry out that they need water by wilting in a dramatic fashion. Instead a prolonged period of... read entire article
Nutrition
Essential elements for plants are usually divided into two groups. Those needed in relatively large quantities are called the macronutrients (nitrogen, sulfur, phosphorus, potassium, calcium and magnesium) and those elements... read entire article
Fertilizer
Soluble salts are at once a bane and a blessing in orchid culture. They can be present in dangerously high concentrations in water supplies and potting media, and yet they are what constitute conventional fertilizers, forming a salt when the water... read entire article
Growing Media
Healthy roots are essential to orchids. Without a substrate conducive to root establishment, growth and function, an orchid cannot absorb the nutrients and water it requires. A growing medium should be firm and yet well aerated... read entire article
Repotting
Organic media decompose into humus, a material, by itself, unfit for orchid roots. In a decomposed medium roots rarely have adequate oxygen to survive and function. Repotting must occur before significant media decomposition takes... read entire article