Professional Iris USA Plantation Planting - Simplified to: Iris USA Plantation Planting

The method of preventing cold by burying soil involves full burial on the ground without the need for digging trenches. The thickness of the covering soil is determined by the local absolute minimum temperature as well as the cold resistance of the plant variety. Typically, the soil covering should be around 20 cm when the winter temperature drops to -15 °C, and 25 cm when it reaches -17 °C. As the temperature decreases, the covering soil should be thicker. Some varieties, like Kyoho and white banana, which have strong cold resistance, can have slightly thinner covering soil.

These plants require more than 4 hours of direct sunlight, can adapt well to temperature changes, and go dormant in the summer. They thrive in fertile, neutral to slightly alkaline soil with a pH level between 6.5 - 8.0. The soil should be warm and well-drained to prevent water accumulation which can lead to waterlogged roots.

When planting, make sure to bury the bulbs 5-8 cm deep and space them closely, about 8-10 cm apart. After pruning during dormancy, remove any dead branches and store the bulbs in a cool, dry place.

Overall, by following these guidelines and adjusting the language and structure for better readability, one can successfully protect plants from cold temperatures by burying soil effectively.

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