Quick Answer
Short Answer: To identify non-toxic plants suitable for transpiration collection, look for plants with a milky sap, avoid those with milky sap, or use a plant that doesn't have toxic sap in the first place. Plants like sassafras, willow, and birch work well. Use a plant with a high water content like those with broad leaves.
Choosing the Right Plant
When selecting a plant for transpiration collection, consider species with high water content per leaf. Plants like willow, birch, and cottonwood have broad leaves that hold a lot of water. They also have a high transpiration rate, meaning they lose water quickly, making them well-suited for transpiration collection. For example, a willow leaf can hold about 3.5 grams of water per square centimeter, while a birch leaf can hold about 2.5 grams of water per square centimeter.
Preparing the Plant
Before using a plant for transpiration collection, make sure to identify it correctly and avoid any that are known to be toxic. For example, sassafras has a sweet, pungent smell and leaves with a unique shape. However, avoid using it if you’re not familiar with its properties. Also, make sure the plant is healthy and free of any diseases or pests that could contaminate the water you collect.
Setting Up the Transpiration Bag
To set up a transpiration bag, start by filling the bag with water and then placing a few leaves from your chosen plant inside. Make sure the leaves are completely submerged in water. Next, seal the bag with a twist-tie or rubber band, making sure to leave a small amount of space at the top for air to enter. This space is crucial for allowing the plant to breathe and transpire properly. Once the bag is set up, hang it in a shaded area and let the plant do its job.
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