Does the orchid like water and sunlight?
Among the many household green plants, orchids are favored for their elegant posture, but the management of their water and light always leaves plant growers confused. The yellowing leaves caused by improper watering and the scars caused by sunburn are all telling of their special care needs. Today, we will start from the physiological characteristics of the plant to restore the true growth demands of orchids.
The light and shadow code for orchid growth
Insights from natural habitats
Observing that wild orchids often grow on the trunks of rainforest trees, the patterned tree shadows give them the characteristic of loving scattered light. Experimental data shows that a light intensity of 20,000-30,000 lux is most suitable for orchid growth, which is equivalent to the morning light filtered through white gauze curtains.
Light intensity classification management
In spring and winter, they can accept 60% of full sunlight, and in summer, it needs to be controlled below 30%. Broad-leafed varieties like the black orchid are more shade-tolerant, while narrow-leafed varieties like thejian orchid can be exposed to more light.
The art of water management
The golden rule of watering
Use the "dry and wet" method: water when the surface of the matrix is dry for 2cm, and extend to 3cm in winter. The water temperature needs to be consistent with the ambient temperature to avoid stimulating the roots with too large a temperature difference.
Accumulated water warning system
When the base of the new leaves becomes transparent and the pseudobulbs shrink, it indicates that the roots have been damaged. At this time, stop watering immediately and use a bamboo stick to poke holes in the planting material to enhance ventilation.
The critical three hours after watering
Light and water response mechanism
Water droplets remaining on the leaf surface can create a magnifying glass effect, with local focusing up to 17 times the normal light intensity. It is recommended to place the plant in a well-ventilated area after watering and let the leaves dry naturally before exposing them to sunlight.
Root water absorption cycle
2-4 hours after watering is the peak time for root water absorption. Moderate lighting at this time can increase water utilization. The best timing for exposure to light can be judged by observing the color changes of the planting material.
To truly understand the water and light needs of orchids, it is necessary to combine their aerial root characteristics. It is recommended to clean the accumulated water in the leaf axils with a cotton swab every month, use breathable materials like pine bark, and create an air layer by raising the bottom of the pot by 3cm. When the flower spike begins to sprout, you can increase the light intensity by 10% to promote flowering.