Tip of the Month -- June
In reality, orchids DO grow on trees, at least a vast majority of them do....Sure, there are some terrestrials that grow on the jungle floor and in the woods where you live, but most have a home in the crotch of or in a branch of a tree in the rainforest.
Their roots are exposed to the light and humidity around them. They enjoy the tropical breezes and rainstorms. One must keep this in mind when growing and re-potting orchids. Most orchids like the big chunky bark mixes that hold a bit of moisture around their roots, yet also allow an ample amount of air to penetrate the mix.
Most orchids like to be watered thoroughly, then left to dry out quickly. It should take an orchid plant 4-7 days to dry out before water is needed. If your plants are staying wet longer than a week, then they are not getting enough air to the roots. If this is allowed to happen over a period of time, root rot is bound to occur.
Some people grow in very loose, airy media, or even in a basket with no media around the roots. Orchids love this.....as long as there is enough moisture in the air to keep the plant hydrated. When growing in this fashion, watering once or twice a day may be required.
In very dry climates, a denser, finer grade mix can be used. This type of mix will hold more moisture for the plant, and subsequently require less frequent watering.
In very humid growing conditions, a chunkier potting material works best. The air is better able to get into the mix, allowing the roots system to dry out, thus preventing root rot.
By keeping in mind the natural environment and growing conditions of your orchids, you can give them what they need to produce healthy leaves, roots, and flowers.
Enjoy the hobby!
Liese