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Garden Glossary |
Chill Hours
Horticulture expert Dr. Lelia Kelly defines the gardening term chill hours. This refers to the number of hours below a certain temperature that is required before a plant will flower. Chill hours are typically used to describe fruit trees. You should pick your fruit variety based on the number of chill hours where you live. If the plant requires fewer chill hours than your location gets, it will bloom in a warm spell in the middle of winter and the blooms will be killed by frost.
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Chlorosis
Horticulture expert Dr. Lelia Kelly defines the gardening term chlorosis. Chlorosis is a yellowing or lack of chlorophyll in the leaves of a plant. Chlorosis can be caused by the incorrect amount of water, a nutrient deficiency, herbicide damage, air pollution, or not enough light. A related term is necrosis which is dead tissue.
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Cold Frame
Horticulture expert Dr. Lelia Kelly defines the gardening term cold frame. A cold frame is a season extender similar to a greenhouse. It is a small structure with a window over the top. Usually it is built so the window is tilted with the low side to the south. People use it to protect tender plants in colder weather. It is not actively heated – hence the cold in the name – but relies on the sun to stay warmer than the outside air.
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Cultivar
Horticulture expert Dr. Lelia Kelly defines the gardening term cultivar. In short a cultivar is a CULTIvated VARiety of a species of plant. Often the cultivar is included in the name of the plant with single quotes around it. Named cultivars were developed by gardeners for certain traits in the plant such as color of flower.
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