The lifespan of dried leaves varies significantly depending on the preservation method.
Generally, pressed leaves that haven't undergone any special preservation treatment will last, on average, about five to seven years before they begin to fade, become brittle, and deteriorate. However, with specific preservation techniques, you can extend their lifespan considerably.
Here's a breakdown:
- Pressed Leaves (Unpreserved): As mentioned, these leaves typically last for 5-7 years. Factors like humidity, light exposure, and handling can shorten this time. They are prone to fading and crumbling.
- Leaves Preserved with Wax or Glycerin: These methods significantly extend the life of dried leaves. While a precise timeframe is difficult to pinpoint (as it depends on the quality of application and storage conditions), properly preserved leaves can last for many years, potentially decades. They retain their color and flexibility much better.
- Microwave-Dried Leaves: The microwave method primarily focuses on quickly drying the leaves. While this speeds up the initial drying process, it doesn't inherently preserve them for longer than traditionally pressed leaves. The primary advantage is speed, not longevity. Expect a similar lifespan to unpreserved pressed leaves (around 5-7 years).
Factors Affecting the Lifespan of Dried Leaves:
- Light Exposure: Direct sunlight accelerates fading.
- Humidity: High humidity can lead to mold and decay.
- Temperature: Extreme temperature fluctuations can damage the leaves.
- Handling: Frequent handling can cause breakage and crumbling.
- Storage: Proper storage in a cool, dark, and dry place is essential.
- Preservation Method: As mentioned, wax and glycerin provide the best long-term preservation.
In conclusion, while simple air-dried or pressed leaves might only last 5-7 years, preserving them using methods like wax or glycerin extends their lifespan substantially. Proper storage is always key to maximizing their longevity.
