In addition to working with trees and a wide variety of shrubs, while pollen can be collected from newly grown plants in the field, most breeding materials are cultivated in greenhouses for controlled pollination to produce hybrid seeds. Greenhouses offer the advantage of regulating internal environmental conditions, such as temperature, humidity, and light, which is essential for successful plant breeding. They also help prevent unwanted insect pollination and protect plants from predators, ensuring a more controlled and efficient breeding process. Especially in colder regions, greenhouses allow for maintaining optimal temperatures above outdoor levels and adjusting humidity within a specific range, which is crucial for producing mature seeds and supporting multiple generations.
The design of greenhouses should include properly installed vents that prevent insects from entering without interfering with temperature regulation. For species that rely on wind pollination, additional features like forced-ventilation systems and air filtration devices to capture airborne pollen are necessary. However, for most plant species, a small, isolated room equipped with basic insect-proof measures is sufficient for testing and managing pollination. In addition, artificial heating systems are often required, and good lighting conditions are highly beneficial. Humidity can be increased through misting or spraying, especially when performing distant hybridization, which often benefits from high temperatures and dark, moist environments to improve success rates. Artificial lighting is also essential to extend daylight hours and provide adequate illumination when natural sunlight is limited.
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