Because there are more than 1,000 genera in the Orchidaceae family, gardeners have a vast selection of orchids to choose from. Orchids are indigenous to so many different parts of the world. Thus, they can thrive in a wide range of climatic circumstances.
Terrestrial orchids have better temperature tolerance than tropical orchids when choosing orchids to grow outside. Because of this, terrestrial orchids are excellent candidates for developing on the ground outside.
Some orchids, particularly terrestrial orchids and hybrid cymbidiums, prefer the cold, even though most prefer temperatures between 50F and 80F
Leaving orchids outside typically poses no issues if your winters are mild. Choosing cold-tolerant orchids, understanding when to water them, and shielding them from frost damage are the keys to the health of your outdoor orchids.
You don't need to bother about extra protection when temperatures drop below 30 degrees Fahrenheit because the majority are frost-hardy. As long as frost doesn't exist on the leaves, it won't harm the majority of orchids.
When water collects on orchid leaves and freezes due to the freezing temperatures, frost forms. The formation of frost typically causes the worst cold damage to orchids.
Before winter approaches, note which orchids in your collection detest the cold. Seed and immature plants are typically more sensitive to cold temperatures than mature plants.
When some tropical plants are in low humidity, it can cause significant water loss through transpiration. If the cold exposure has affected water absorption, either momentarily or permanently, extreme water stress may ensue.
Ensuring your orchid receives adequate light during the shorter winter days will help it live longer. Due to the abundant sunshine that orchids need, the ideal locations for orchids in the home are frequently near windows.
The best approach to guard against cold orchid damage is to bring container-grown orchids inside for the winter. This is merely some temporary protection till the cold passes. But you may also take precautions when your orchids are outside.
Growers should look for symptoms and maybe use a preventive fungicide because weak or wounded plants are more vulnerable to disease assault.
Consider covering your orchids with a plastic tarp that can insulate and protect them from the elements if an excessive cold is predicted for extended periods. Coverings can also safeguard your orchids against the wind. You may also use burlap, sheets, blankets, towels, and other covers.
Check whether your orchid roots are dry and gray during the winter months. If so, your plant could want additional water.