Cymbidium orchids have unique soil requirements that differ from most other orchid varieties. When repotting your Cymbidium orchids, it’s essential to use a potting mix specifically formulated to meet their needs. Let’s explore the key considerations for selecting the optimal repotting soil for your Cymbidium orchids.
Acidic Soil with Excellent Drainage
Cymbidium orchids prefer an acidic soil with a pH between 5.5 and 6.5. This is in contrast to many other orchids that thrive in a more neutral or slightly alkaline potting mix. Additionally, Cymbidiums require excellent drainage to prevent root rot.
Smaller Particle Size
Unlike typical orchid bark mixes, Cymbidium orchids need a potting mix with smaller particles. Commercial mixes designed for Cymbidiums often include a blend of coconut coir, peat moss, perlite, and clay particles.
Terracotta Pots
Terracotta pots are an excellent choice for Cymbidium orchids as they help wick away excess moisture and maintain a balanced moisture level around the roots. Be sure to use a pot with ample drainage holes.
Recommended Repotting Mix
A suitable repotting mix for Cymbidium orchids can be made by combining:
– Bark
– Peat moss
– Perlite
– Clay particles
You can also add other ingredients like Corangamite shells, river pebbles, tree fern fronds, rice hulls, and peanut shells to enhance drainage and nutrient release.
Avoid Regular Orchid Mixes
While regular orchid potting mixes can be used, they may not provide the ideal conditions for Cymbidium orchids. It’s best to use a mix specifically formulated for Cymbidiums or to modify a regular mix by adding smaller particles and acidic components.
Sphagnum Moss as a Substitute
Sphagnum moss can be used as a substitute for peat moss in Cymbidium orchid potting mixes. Both provide acidity and help with moisture retention.
Repotting Frequency and Hygiene
Cymbidium orchids typically need to be repotted every 2-3 years, ideally in the spring after flowering. When repotting, ensure proper hygiene by sterilizing tools and removing old, leafless backbulbs to minimize the risk of root rot and fungal infections.
Potting-On and Fertilization
Potting-on, which involves transferring the orchid to a larger pot with fresh mix, can be done at any time of the year. However, it’s recommended to repot within a year if the original mix is older than 18 months to prevent root rot.
Fertilize your Cymbidium orchids regularly, every 1-2 weeks during the growing season and every 3-4 weeks during dormancy. Use a balanced fertilizer diluted to half strength or a specialty orchid fertilizer.
By following these guidelines, you can create an optimal repotting soil for your Cymbidium orchids, ensuring they thrive and produce beautiful flowers.
References:
1. Epic Gardening. (2023). How to Plant, Grow and Care For Cymbidium Orchids. Retrieved from https://www.epicgardening.com/cymbidium-orchids/
2. Hartley Botanic. (2020). Repotting Cymbidium Orchids – by Roger Marshall. Retrieved from https://hartley-botanic.com/magazine/repotting-cymbidium-orchids/
3. OSCOV. (n.d.). HOW I REPOT CYMBIDIUMS by Brian MilIigan. Retrieved from https://oscov.asn.au/articles/how-i-repot-cymbidiums-by-brian-miliigan/