Blc Arabesque cattleya orchid 

Suggested Orchids to Grow

Low light orchids: 
 - Paphiopedilum(Slipper Orchids)
-Phalaenopsis(moth orchids),   
-Ludisia and other jewel orchids (grown for the beautiful foliage

Brighter eastern exposure: Oncidinae intergenerics such
as Colmanara Wildcat
-Miltonia (Pansy orchids)

Bright light but little direct sun: Phragmipediums, Oncidiums
and Brassias

Bright sunny exposures:  
Cattleyas, Cymbidiums, Ascocendas/Vandas, and
many Dendrobiums

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Windowsill growing requires no special fixtures, other than a humidity tray on which to place your potted plants, and a nearby spray bottle to mist your plants occasionally. If you have more than a dozen orchids, a one-gallon spray tank with a watering hose will make it easier to water them.

Choose the brightest windows in your house for your orchids. If you only have clear northern exposure, or even partially obstructed eastern exposure, you may still be able to grow some orchids.  If your home has western and Southern exposure, you’ll be able to grow and flower a much wide variety of orchids right on your windowsill.     An unobstructed southern exposure offers the most flexibility for growing orchids.  

In northern, eastern, or other shady exposaures, keep your plants as close to the glass as possible. Light intensity falls off rapidly even a foot away for a window. In bright sunny windows, g   row your plants   several inches from the window with sun loving orchids such as cattleyas and dendrobiums closest to the glass. Shade loving plants such as phalaenopsis can be grow in the shadow of these plants, or on a table close to the window. Direct sunlight on orchid plants can burn leaves especially during the hot summer months. Heat build up can be a problem in western exposures during the late afternoon as the sun begins to go down. A sheer curtain, or window-blind, may be needed to protect plants from excessive light and heat at these times. Ample air circulation is also important and a light fan directed just above the leaves, will help keep your plants cool.

After light, maintaining adequate humidity is probably the biggest problem in windowsill growing, especially in the winter months. Group plants, and spray them often with a water mister to help increase humidity. Be sure to keep moisture-loving orchids well watered at all times. 

Watering and fertilizer will also need to follow a more natural seasonal schedule with greatest frequency during the brighter warmer summer months and less during winter.  Insect pests can be gently washed or scraped off your plant, or treated with a natural insecticidal soap or horticultural fine oil. Isopropyl alcohol, which is available at drug stores, can also be used to spot treat plants.     Be sure to carefully read all instruction labels on insecticides and only use those recommended for indoor use.