Can orchids be grown in humus soil?
As a traditional famous flower in China, the choice of cultivation medium for orchids directly affects the development of the root system and the health of the plant. This article provides professional soil mixture suggestions based on the orchid variety characteristics and the most concerned issues of humus soil and ordinary nutrient soil applications among orchid enthusiasts.
I. Tips for Using Humus Soil in Orchid Cultivation
1.1 Analysis of the Nutritional Value of Humus Soil
Humus soil is rich in organic matter and trace elements, with a humic acid content reaching 40%-60%, which can provide continuous nutrients for orchids. However, pure humus soil has a higher density and long-term use can easily lead to compaction.
1.2 Scientific Proportioning and Improvement Scheme
It is recommended to mix humus soil with granular substrates in a 3:7 ratio: • Basic formula: 30% humus soil + 30% ceramsite + 20% volcanic stone + 20% pine bark• Advanced formula: 30% humus soil + 25% stone powder + 20% perlite + 15% coconut shell charcoal + 10% bone mealThis structure retains nutrients while ensuring a permeability and ventilation rate of >80%.
II. In-depth Analysis of the Suitability of Nutrient Soil
2.1 Taboos in Epiphytic Orchid Cultivation
Epiphytic orchids like Phalaenopsis and Dendrobium require 70% air contact surface for their roots. Experimental data shows that the mortality rate of epiphytic orchids grown in pure nutrient soil reaches 62%. It is recommended to use a combination of bark, sphagnum moss, and charcoal as the growing medium.
2.2 Improvement Scheme for Terrestrial Orchids
Terrestrial orchids like Cymbidium and Hemerocallis can use nutrient soil for a short period but need to add 30% coarse river sand and 20% vermiculite to improve the structure. Regularly supplement with slow-release Ogreen fertilizer to maintain an EC value between 0.8-1.2 mS/cm.
III. Practical Maintenance Suggestions
Check the pH value of the medium (ideal range 5.5-6.5) every spring during potting, and add 5% rice husk charcoal to adjust the acidity and alkalinity. Before the rainy season arrives, spread 1cm thick ceramsite on the pot surface to prevent root rot occurrences.