What does Untreated Seed mean? Untreated seeds are seeds that have not been processed using any physical, biological, or chemical techniques prior to being packaged and sold at garden centers. This is in contrast to treated seeds. If growing using untreated seeds, it is important to only plant them in ideal growing conditions to ensure a productive […]

What does Unit heater mean? Unit heaters are commonly used as forced air-heaters in greenhouses. These heaters are usually mounted overhead and receive heat from a boiler in the form of hot water or steam. Some unit heaters also contain fireboxes. These heaters are crucial for protecting plants and vegetables from the cold while maintaining an adequate […]

What does Unisexual flower mean? A plant has two parts a pistil, often described as a female part of the plant, and a stamen, often described as a male part of the plant. Unisexual flowers only have either a pistil or stamen. A unisexual flower with pistils is known as pistillate flowers and a unisexual flower with […]

What does Uneven Span Greenhouse mean? An uneven-span greenhouse is a greenhouse with one roof slope longer than the other. This is generally an adaptation of a regular greenhouse when it is situated on a a hilly terrain or to take advantage of solar angles. In uneven-span greenhouses, the roof is not equal in width or pitch, […]

What does Undercut mean? An undercut is a particular type of cut made to a tree branch or trunk. Undercutting is often used when trimming or pruning a tree. This method is used to minimize damage to the tree during pruning. To undercut a tree branch, a cut is made through one-third to one-half of the branch, […]

What does Umbel mean? An umbel is a cluster of flowers that consists of short flower stalks, or pedicels, that spread from a common point. This cluster closely resembles the ribs or spokes of an umbrella. Umbels can be made up of compound or simple clusters. The size of these clusters can vary, and the shape can […]

What does Ultraviolet B (UVB) mean? Ultraviolet light refers to electronic radiation that has a longer wavelength than X-rays, but shorter than visible light. This natural light is produced by the sun, but it is often artificially replicated in indoor gardens to encourage plant growth and development. While Ultraviolet B only makes up around 0.15% of natural […]

What does Ultraviolet A (UVA) mean? Ultraviolet light refers to electronic radiation that has a longer wavelength than X-rays, but shorter than visible light. This natural light is produced by the sun, but it is often artificially replicated in indoor gardens to encourage plant growth and development. Ultraviolet A lighting or rays refers to long-wave, black light […]

What does Ultrasonic repeller mean? Pests are the bane of outdoor gardeners, but an ultrasonic repeller may be able to repel many types. This includes insects and rodents, preventing them from damaging your crops. More Info on Ultrasonic repeller Pests have plagued gardeners since the Agricultural Revolution. Hordes of: locusts, mice and other rodents, deer – the list […]

What does Ultrasonic Fogger mean? Commonly used in hydroponic systems, ultrasonic foggers are designed to create a fine mist that carries nutrients to the plants’ roots. These improve oxygen flow to the roots while creating a humid atmosphere for the plants to thrive in and grow. Depending on the type of crop, this apparatus can be used […]