Tulip Poplar Germination
The tulip poplar tree (Liriodendron tulipifera), also known as the yellow-poplar or whitewood, grows to a height of 150 feet or more. The tree is valued as a honey tree and for its wood, which holds a high commercial value. Tulip poplar trees begin producing viable seeds when they are approximately 15 years old. They continue to produce seeds until they are more than 200 years old. Does this Spark an idea?
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Production and Viablity
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A prolific seed producer, one tulip tree will bear around 29,000 seeds annually. The U.S. Department of Agriculture states that only 5 percent to 20 percent of the seeds produced by the tulip tree are viable and will germinate. The tulip poplar tree will produce seeds most prolifically when the weather is dry and warm. During rainy weather, the seed dispersal is usually low. The seeds, which remain viable for four to seven years, germinate when weather conditions are favorable.
Cold Stratification
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The seeds of the tulip poplar tree require a period of cold stratification to ensure germination. The trees disperse the seeds onto the forest floor in fall. The seeds lay dormate throughout winter until spring. They may be gathered by hand during autumn and placed in moist sand. Refrigerate the seeds at 32 to 50 degrees Fahrenheit for 70 to 90 days before planting. The longer the seed undergoes cold stratification, the greater the chance that it will successfully produce a seedling.
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Germination Requirements
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Tulip poplar seeds require moist soil to germinate. The seeds must be in contact with evenly moist soil for three weeks or more before the seeds will begin to grow. Without adequate moisture, the seeds will remain dormant. The seeds germinate best in soil that contains a high percentage of decomposing organic matter, such as leaf litter. Seedlings prefer a location that offers full sun. They do not do well when they must compete with weeds or other trees for soil nutrients.
Fire and Logging
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Forest fires aid the seeds to germinate. The fire clears away underbrush and leaf litter, so the seeds come into contact with the nutrient-rich soil. Fire also eradicates competition plants and trees, freeing up the soil's nutrients for the tulip poplar's seeds. Logging can have an adverse effect on seed germination. If the logging takes place during the spring, the seeds will remain dormant because of all the soil disturbances.
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References
Resources
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