Category: Encyclopedia


What does Zone mean? A zone is a region used to classify plant hardiness by various climates. An appropriate climate for specific plants is essential for optimum plant growth and yield. The zones depicted on a zone map help provide accurate information to determine a plant’s suitability for a given location. The United States Department of Agriculture […]

Zinc (Zn)

What does Zinc (Zn) mean? Zinc is one of the chemical elements on the periodic table with the symbol Zn and the atomic number 30. It is the 24th most abundant element on Earth’s crust and has five stable isotopes. Zinc is an important mineral that is naturally present in some food. It is even added to foods […]

Zero Tolerance

\What does Zero Tolerance mean? Zero tolerance is a widely used expression in various organizations, businesses, and institutions that refers to policies that essentially ban the presence of something, which is most often dangerous goods, weapons, and/or harmful substances like drugs. Varying degrees of punishment are often in place for anyone caught violating a zero tolerance policy. […]


What does Yucca mean? The yucca is an edible tuberous root commonly consumed in Africa and arid areas of Central America. Rich in carbohydrates, yuccas are extremely starchy and contain plenty of vitamins, nutrients, and minerals. According to researchers, the yucca root includes resveratrol and steroidal saponins, which are known for their important health benefits. Yuccas are […]

Yellow Leaf Spot

What does Yellow Leaf Spot mean? Yellow leaf spot is a generic term for a fungal disease that can affect cannabis plants. The scientific name for yellow leaf spot is leaf septoria. In infected plants, uniform spots or lesions appear first on lower leaves. These spots will eventually cause death of the leaves. ‘Yellow leaf spot’ should […]


What does Xylem mean? Xylem is a complex tissue in the vascular system of the higher plants that transports water from the roots to the leaves and shoots. Together with phloem — another complex tissue — the xylem also helps to structurally support the plant. Xylem consists of wood fibers, parenchyma cells, vessels, and tracheid. The term […]


What does Xeric mean? Xeric refers to plants or a landscape that flourishes with very little water. Desertscapes usually feature xeric plants. Xeric plants require very little, if any, supplemental watering after the plant is fully established. In order to be fully established, most xeric plants require about 18 to 24 months of supplemental watering when first […]

Worm Castings

What does Worm Castings mean? Worm castings, also known as vermicast, are a worm’s manure in its natural form. The waste produced by worms as they eat compost, natural decaying debris in soil, and other organisms such as rotifers, nematodes, protozoans, bacteria, and fungi becomes a nutrient-rich soil additive. Worm castings contain an abundance of bacteria, remnants […]

Wood Extractive

What does Wood Extractive mean? Wood extractives, or wood extracts, are tiny molecules that are extracted from wood using solvents or other extraction methods. The extractives are the waxes, fatty acids, resin acids, and terpenes of a tree. They are classified as phenolic, aliphatic, alicyclic compounds, or other lesser compounds. The overall composition of the extracts varies […]

Winter Kill

What does Winter Kill mean? Winter kill refers to a plant dying because of the harsh effects of winter time weather. Usually prolonged cold weather does not damage a dormant plant as significantly as ongoing temperature fluctuations. Plants acclimatize slowly to temperature changes as the weather becomes colder and colder. A sudden and unexpected hard freeze often […]
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