Does orchid like acidic soil?
As one of the top ten famous flowers in China, orchids have unique requirements for the growing medium. Many novice orchid growers often encounter hindered plant growth due to neglecting soil characteristics, among which the control of soil pH is particularly crucial.
Orchid Soil pH Characteristics
Suitable pH Range
Experimental data shows that orchids grow best in a pH range of 5.5-6.5, where the slightly acidic environment can activate the absorption function of root cells. When the soil becomes alkaline beyond pH 7, the roots will experience iron absorption障碍, manifested as leaf tip burning and new bud shrinkage.
Hazards of pH Imbalance
Alkaline soil can compact the planting material gaps, leading to water retention and causing root rot. Excessively strong acidity (pH <)
Analysis of Orchid Potting Soil Formulas
Classic Three-in-One Formula
A combination of mature pine bark (40%), volcanic rock (30%), and peanut shells (30%) ensures an acidic environment and good breathability. The bark needs to be boiled at high temperatures to remove resins, and volcanic rock with 3-5mm particles is best for drainage.
Advanced Five-Layer Structure
A 3cm layer of ceramsite is placed at the bottom of the pot for drainage, the middle layer is mixed with植金石 and snake wood chips, and the surface is covered with moss to retain moisture. This structure simulates the native environment of orchids, allowing for quick drainage during the rainy season and maintaining root moisture during dry spells.
Practical Skills for Soil Maintenance
Methods for pH Adjustment
Watering with diluted white vinegar (1000 times) monthly can maintain acidity, and adding sulfur powder (0.5g per liter of soil) when alkalization signs appear. Use ferrous sulfate cautiously, as excessive amounts can lead to salt accumulation.
Planting Material Activation Treatment
During potting in spring every year, mix the old planting material with fresh pine needles at a ratio of 2:1, place them in a sealed bag and ferment for 30 days. The fermentation product contains humic acid and beneficial bacteria, which can restore compacted planting material to a loose state.
Mastering soil pH management is the key to successful orchid cultivation. A systematic plan needs to be formed from the proportion of planting material to daily maintenance. It is recommended to establish a maintenance log, recording pH test data and adjustment measures each time, gradually exploring the most suitable soil preparation method for the local environment.