Cymbidium orchids are a popular choice among orchid enthusiasts, known for their vibrant flowers and relatively easy care requirements. One of the most critical aspects of growing healthy cymbidiums is providing them with the right potting mix. In this article, we’ll dive into the ideal proportion of bark to perlite, as well as explore the use of homemade fertilizers like banana peels and eggshells in your cymbidium orchid potting mix.
Ideal Proportion of Bark to Perlite
Bark and Perlite Mix
A common and effective potting mix for cymbidiums is a combination of 80% seedling grade orchid bark (1/8 to 1/4 inch) and 20% #3 perlite. This ratio provides excellent drainage and aeration for the roots, which is essential for the health and growth of your cymbidium orchid.
Alternative Mix
Another successful mix for cymbidiums uses coconut husk chips and #3 perlite. This combination also offers good water retention and aeration, making it a suitable alternative to the traditional bark and perlite mix.
Homemade Fertilizers
Banana Peels and Eggshells
While banana peels and eggshells can be used as natural fertilizers, they are not typically added directly to the potting mix. Instead, these materials can be composted and then incorporated into the soil as a nutrient-rich amendment, providing your cymbidiums with a slow-release source of essential nutrients.
Blood and Bone
Blood and bone can also be used as a fertilizer for cymbidiums. However, it is not usually mixed directly into the potting medium. Blood and bone is more commonly applied as a separate fertilizer application, allowing you to better control the nutrient levels in the potting mix.
Potting Mix Recipe
Basic Recipe
A basic potting mix recipe for cymbidiums includes six parts pine bark, one part dolomite, and one part blood and bone. This mix can be further customized by adding ingredients like perlite, charcoal, and other minerals to optimize drainage, aeration, and nutrient availability.
Customization
The ideal potting mix for your cymbidiums will depend on your local climate, watering habits, and personal preferences. Many growers experiment with different ingredient combinations to find the perfect mix for their specific growing conditions and needs.
Troubleshooting Tips
Mold and Bad Smells
If you notice mold or unpleasant odors coming from your cymbidium’s potting mix, it’s a sign of excessive moisture and potential root rot. Check for poor drainage and compacted soil, and adjust the potting mix accordingly to improve aeration and prevent further issues.
Root Rot
Root rot can be a serious problem for cymbidiums and is often caused by an unsuitable potting mix. Symptoms include stunted growth, yellowing leaves, and overall plant decline. If you suspect root rot, take immediate action to save your plant by repotting it in a fresh, well-draining mix.
Expert Guides
Loren Batchman
Loren Batchman, an experienced cymbidium grower, recommends a potting mix of 80% seedling grade orchid bark and 20% #3 perlite for mature plants. For seedlings, he suggests using a mix of coconut husk chips and perlite.
Orchid Wise Society
The Orchid Wise Society emphasizes the importance of a well-draining potting mix that still retains some moisture for cymbidiums. They recommend using a combination of pine bark, clay balls, perlite, vermiculite, coco fibre, peat moss, charcoal, pumice, or lava rock to create a customized, well-aerated medium.
Contaminants and Chemicals
Tannins
Some pine bark mixes may contain tannins, which can be harmful to orchids. It’s essential to use inert ingredients that won’t break down quickly and release potentially damaging substances.
Pesticides and Fungicides
Commercial potting mixes may contain pesticides and fungicides, which can be detrimental to your cymbidiums. Whenever possible, opt for organic and pesticide-free ingredients to ensure the health and safety of your plants.
By following these guidelines and recommendations, you can create the perfect potting mix to help your cymbidium orchids thrive. Remember, the ideal mix may require some experimentation to find the right balance for your specific growing conditions and preferences.
References
- Batchman, L. (2009). Cymbidium Potting Mixes. CSA Journal, 9(5), 35-37.
- Lynn. (2017). Cymbidium potting mix recipe. YouTube.
- Reddit. (2016). Ok, I just bought my first Cymbidium, please help me not kill it.
- Orchid Wise. (n.d.). Cymbidium Orchid Potting Medium.
- Greg. (2024). Best Soil Potting Mix for Cymbidium sinense.