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Horticulture
N/A
117
Plant Sciences
Graduate
09/16/2008

Additional Plant Sciences Flashcards

 


 

Cards

Term
Acid soil
Definition
Soil with a pH lower than 7.0
Term
Alkaline soil
Definition
Soil with a pH higher than 7.0
Term
pH
Definition
Measure of the amount of lime (calcium) in soil
Term
Acre
Definition
A measure of land totaling 43,560 square feet.
Term
Square Acre
Definition
A measure of land totaling 208.75 feet on each side
Term
Aerate
Definition
Loosening or puncturing the soil to increase water penetration.
Term
Air layering
Definition
A specialized method of plant propagation accomplished by cutting into the bark of the plant to induce new roots to form.
Term
Annuals
Definition
Plants whose life cycle lasts only one year, from seed to blooms to seed.
Term
Arboretum
Definition
A garden with a large collection of trees and shrubs cultivated for scientific or educational purposes.
Term
Aquatics
Definition
Plants which grow in, live in, or live on the water.
Term
Bare root
Definition
Plants offered for sale which have had all of the soil removed from their roots.
Term
Bedding plant
Definition
Plants (mainly annuals), nursery grown and suitable for growing in beds. Quick, colorful flowers.
Term
Biennial
Definition
A plant that usually only lives two years, normally producing flowers and seed the second year.
Term
Bolting
Definition
Vegetables which quickly go to flower rather than producing the food crop. Usually caused by late planting and too warm temperatures.
Term
Bonsai
Definition
The art of growing carefully trained, dwarf plants in containers.
Term
Botanical name
Definition
The Latin or "scientific" name of a plant, usually composed of two words,the genus and the species.
Term
Bract
Definition
Modified leaves growing just below a flower. Often confused with the flower itself.
Term
Bud
Definition
Early stages of development of a flower or plant growth.
Term
Bulb
Definition
The thickened underground storage organ of the group of perennials which includes daffodils and tulips.
Term
Cambium
Definition
The thin membrane located just beneath the bark of a plant.
Term
Catkin
Definition
A slender, spikelike, drooping flower cluster.
Term
Chlorophyll
Definition
The green pigment in leaves. When present and healthy usually dominates all other pigments.
Term
Complete Fertilizer
Definition
A plant food which contains all three of the primary elements... nitrogen, phosphorus and potassium.
Term
Compost
Definition
An organic soil amendment resulting from the decomposition of organic matter.
Term
Conifer
Definition
A cone bearing tree with tiny needlelike leaves.
Term
Corm
Definition
A thickened underground stem which produces roots, leaves and flowers during the growing season.
Term
Cover crop
Definition
A crop which is planted in the absence of the normal crop to control weeds and add humus to the soil when it is plowed in prior to regular planting.
Term
Crown
Definition
The point at which a plants roots and top join. (usually at soil level)
Term
Cultivate
Definition
Process of breaking up the soil surface, removing weeds, and preparing for planting.
Term
Cuttings
Definition
A method of propagation using sections of stems, roots or leaves.
Term
Damping off
Definition
A fungus, usually affecting seedlings and causes the stem to rot off at soil level. Sterilized potting soil and careful sanitation practices usually prevent this.
Term
Dead head
Definition
The process of pinching off used or spent blooms to keep the plants well groomed and to prevent them from setting seed. This will promote continued bloom.
Term
Dibble stick
Definition
A pointed tool used to make holes in the soil for seeds, bulbs, or young plants.
Term
Dethatch
Definition
Process of removing dead stems that build up beneath lawn grasses.
Term
Dividing
Definition
The process of splitting up plants, roots and all that have began to get bound together. This will make several plants from one plant, and usually should be done to mature perennials every 3 to 4 years.
Term
Dormancy
Definition
The yearly cycle in a plants life when growth slows and the plant rests. Fertilizing should be withheld during this period.
Term
Double digging
Definition
Preparing the soil by systematically digging an area to the depth of two shovels.
Term
Double flower
Definition
A flower with many overlapping petals which gives it a very full appearance.
Term
Drip line
Definition
The circle which would exist if you drew a line below the tips of the outer most branches of a tree or plant.
Term
epiphyte
Definition
A plant which grows on another plant but gets its nourishment from the air and rainfall. They do no damage to the host plant.
Term
Erosion
Definition
The wearing away, washing away, or removal of soil by wind, water or man.
Term
Espalier
Definition
Process of training a tree or shrub so its branches grow in a flat pattern.
Term
Evergreen
Definition
A plant which never loses all of it's leaves at one time.
Term
Eye
Definition
An undeveloped bud growth which will ultimately produce new growth.
Term
Evaporation
Definition
Process by which water returns to the air. Higher temperatures speed the process.
Term
Fertilizer
Definition
Organic or inorganic plant foods which may be either liquid or granular used to amend the soil in order to improve the quality or quantity of plant growth.
Term
Flat
Definition
A shallow box or tray used to start cuttings or seedlings.
Term
Foliar feeding
Definition
Fertilizer applied in liquid form to the plants foliage in a fine spray.
Term
Forcing
Definition
The process of hastening a plants growth to maturity or bloom.
Term
Frond
Definition
The term used to describe the branch and leaf structure of a fern or members of the palm family.
Term
Frost
Definition
The condensation and freezing of moisture in the air. Tender plants will suffer extensive damage or die when exposed to this.
Term
Germinate
Definition
The process of the sprouting of a seed.
Term
Girdling
Definition
The choking of a branch by a wire or other material, most often in the stems of woody plants that have been tied to tightly to a stake or support.
Term
Grafting
Definition
The uniting of a short length of stem of one plant onto the root stock of a different plant. This is often done to produce a hardier or more disease resistant plant.
Term
Ground cover
Definition
A group of plants usually used to cover bare earth and create a uniform appearance.
Term
Growing season
Definition
The number of days between the average date of the last killing frost in spring and the first killing frost in fall.
Term
Hardening off
Definition
The process of gradually acclimatizing greenhouse or indoor grown plants to outdoor growing conditions.
Term
Hardpan
Definition
The impervious layer of soil or clay lying beneath the topsoil.
Term
Hardiness
Definition
The ability of a plant to withstand low temperatures or frost, without artificial protection.
Term
Heading back
Definition
Cutting an older branch or stem back to a stub or twig.
Term
Heeling in
Definition
Temporarily setting a plant into a shallow trench and covering the roots with soil to provide protection until it is ready to be permanently planted.
Term
Herbaceous
Definition
Describes a plant with soft rather than woody tissues.
Term
Honeydew
Definition
The sticky secretion produced by sucking insects such as aphids.
Term
Humus
Definition
The brown or black organic part of the soil resulting from the partial decay of leaves and other matter.
Term
Hybrid
Definition
The offspring of two plants of different species or varieties of plants. These are created when the pollen from one kind of plant is used to pollinate and entirely different variety, resulting in a new plant altogether.
Term
Hydroponics
Definition
The science of growing plants in mineral solutions or liquid, instead of in soil.
Term
Lath
Definition
In gardening, an overhead structure of evenly spaced slats of wood or other materials used to create shade.
Term
Layering
Definition
A method of propagation, by which a branch of a plant is rooted while still attached to the plant by securing it to the soil with a piece of wire or other means.
Term
Leaching
Definition
The removal or loss of excess salts or nutrients from soil. The soil around over fertilized plants can be cleaned this way by large quantities of fresh water used to 'wash' the soil. Areas of extremely high rainfall sometimes lose the nutrients from the soil from this method.
Term
Leaf mold
Definition
Partially decomposed leaf matter, used as a soil amendment.
Term
Loam
Definition
A rich soil composed of clay, sand, and organic matter.
Term
Manure
Definition
Organic matter, excreted by animals, which is used as a soil amendment and fertilizer. Green-colored mixes of this are plant cover crops which are tilled into the soil.
Term
Microclimate
Definition
Variations of the climate within a given area, usually influenced by hills, hollows, structures or proximity to bodies of water. (i.e. when it's raining at your house, and the sun is shining on the other side of the street)
Term
Micro nutrients
Definition
Mineral elements which are needed by some plants in very small quantities. If the plants you are growing require specific 'trace elements' and they are not available in the soil, they must be added.
Term
Mulch
Definition
Any loose material placed over the soil to control weeds and conserve soil moisture. Usually this is a coarse organic matter, such as leaves, clippings or bark, but plastic sheeting and other commercial products can also be used.
Term
Native plant
Definition
Any plant that occurs and grows naturally in a specific region or locality.
Term
Naturalize
Definition
To plant randomly, without a pattern. The idea is to create the effect that the plants grew in that space without man's help, such as you would find wild flowers growing.
Term
Node
Definition
The part of a stem from which a leaf or new branch starts to grow.
Term
Organic gardening
Definition
The method of gardening utilizing only materials derived from living things. (i.e. composts and manures)
Term
Organic material
Definition
Any material which originated as a living organism. (i.e. peat moss, compost, manure)
Term
Parasitic plant
Definition
A plant which lives on, and acquires it's nutrients from another plant. This often results in declined vigor or death of the host plant.
Term
Peat moss
Definition
The partially decomposed remains of various mosses. This is a good, water retentive addition to the soil, but tends to add the acidity of the soil pH.
Term
Perennial
Definition
A nonwoody plant which grows and lives for more than two years. These usually produce one flower crop each year, lasting anywhere from a week to a month or longer.
Term
Perlite
Definition
A mineral, which when expanded by a heating process forms light granuals. It is a good addition to container potting mixes, to promote moisture retention while allowing good drainage.
Term
Pest
Definition
Any insect or animal which is detrimental to the health and well being of plants or other animals.
Term
Photosynthesis
Definition
The internal process by which a plant turns sunlight into growing energy. The formation of carbohydrates in plants from water and carbon dioxide, by the action of sunlight on the Chlorophyll within the leaves.
Term
Pinching back
Definition
Utilizing the thumb and forefinger to nip back the very tip of a branch or stem. Pinching promotes branching, and a bushier, fuller plant.
Term
Pistil
Definition
The seed-bearing organ of a flower, consisting of the ovary, stigma, and style.
Term
Pollination
Definition
The transfer of pollen from the stamen (male part of the flower) to the pistil (female part of the flower), which results in the formation of a seed.
Term
Hybrid pollination
Definition
pollen from one kind of plant is transferred to an entirely different variety, resulting in a new plant altogether.
Term
Potting soil
Definition
A soil mixture designed for use in container gardens and potted plants. It should be loose, light, and sterile.
Term
Propagation
Definition
Various methods of starting new plants ranging from starting seeds to identical clones created by cuttings or layering.
Term
Pruning
Definition
The cutting and trimming of plants to remove dead or injured wood, or to control and direct the new growth of a plant.
Term
Rhizome
Definition
A modified plant stem which grows horizontally, under the surface of the soil. New growth then emerges from different points of the rhizome. Irises and some lawn grasses are rhizome plants.
Term
Root ball
Definition
The network of roots along with the attached soil, of any given plant.
Term
Rootbound
Definition
A condition which exists when a potted plant has outgrown its container. The roots become entangled and matted together, and the growth of the plant becomes stunted.
Term
Rooting hormone
Definition
A powder of liquid growth hormone, used to promote the development of roots on a cutting.
Term
Runner
Definition
A slender stem growing out from the base of some plants, which terminates with a new offset plant. The new plant may be severed from the parent after it has developed sufficient roots.
Term
Relative humidity
Definition
The measurement of the amount of moisture in the atmosphere.
Term
Scion
Definition
A short length of stem, taken from one plant which is then grafted onto the rootstock of another plant.
Term
Single flower
Definition
A flower having only a minimum number of petals for that variety of plant.
Term
Sphagnum
Definition
A bog moss which is collected and composted. Most peat moss is composed primarily of sphagnum moss. This moss is also packaged and sold in a fresh state, and used for lining hanging baskets and air layering.
Term
Spore
Definition
The reproductive cell of ferns, fungi and mosses. (these plants do not produce seeds)
Term
Sucker
Definition
A growth originating from the rootstock of a grafted plant, rather than the desired part of the plant. This growth should be removed, so it doesn't draw energy from the plant.
Term
Systemic
Definition
A chemical which is absorbed directly into a plants system to either kill feeding insects on the plant, or to kill the plant itself.
Term
Tap root
Definition
The main, thick root growing straight down from a plant. Not all plants have this.
Term
Tender plants
Definition
Plants which are unable to endure frost or freezing temperatures.
Term
Tendril
Definition
The twisting, clinging, slender growth on many vines, which allows the plant to attach themselves to a support or trellis.
Term
Thatch
Definition
The layer of dead stems that builds up under many lawn grasses. This should be removed periodically to promote better water and nutrient penetration into the soil.
Term
Thinning
Definition
Removing excess seedlings, to allow sufficient room for the remaining plants to grow. This also refers to removing entire branches from a tree or shrub, to give the plant a more open structure.
Term
Topiary
Definition
A method of pruning and training certain plants into formal shapes such as animals.
Term
Top soil
Definition
The top layer of native soil. This term may also apply to good quality soil sold at nurseries and garden centers.
Term
Transpiration
Definition
The release of moisture through the leaves of a plant.
Term
Transplanting
Definition
The process of digging up a plant and moving it to another location.
Term
Tuber
Definition
A flat underground stem which stores food and plant energy and from which a plant grows. (e.g. Dahlias)
Term
Variegated
Definition
Leaves which are marked with multiple colors.
Term
Vermiculite
Definition
The mineral 'mica' which has been heated to the point of expansion. A good addition to container potting mixes, this helps retain moisture and air within the soil.
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