Glossary of Garden Terms

vegetable and flower garden
Loading... 8 view(s)
Glossary of Garden Terms

Gardening Terms that Are Helpful for Experienced and Beginning Gardeners to Know

How many times have you read a gardening article, looked at a website or catalog and wondered, “What does that mean?” We've compiled a list of garden terms for your referral during the upcoming garden season. (Have a question about a gardening term that you don't find here? Email us so we an add it to the list

AAS- All American Selection. These are flower and vegetable varieties that have been grown and tested throughout the US and proven themselves to do well in all parts of the country.

Acidic Soil- A soil that has a pH below 7, typical of clay soils. Azaleas, camellias, dogwoods and roses like acidic soils.

Alkaline Soil- A soil that has a pH of 7 or higher.

Annual Plant- A plant living one year or less, usually planted in the spring after the last frost. During this time, the plant grows, blooms, produces seeds, and dies.

Balled & Burlapped- The roots of the plant have soil attached and are held in place with burlap or some other material.

Bare Root- The roots of the plant are bare, with no soil.

Biennial- Of two seasons duration, from germination to maturity and death, usually developing vegetative growth the first year and flowering, fruiting, and dying the second year. Biennials need exposure to winter temperatures to trigger flowering or fruit production the second year.

Bulb- A resting stage of a plant that is usually formed underground and consists of a short stem base bearing one or more buds enclosed in fleshy leaves and buds (tulip, daffodil, etc).

Chill Hour Req.- Temperatures below 40 F. Blueberries, peaches, apples and many other fruit-bearing plants must be exposed to these cold temperatures in order to flower and produce fruit the following season. Chill hour requirements can vary from 150 to 700-800 hours (also known as vernalization) .

Corm- A rounded, thick modified underground stem base bearing membranous or scaly leaves and buds (gladiolus, crocus, etc).

Crown- The base of the plant, where the stem and root meet.

Cultivar- A cultivated variety (C.V.) or strain that originated and has persisted under human cultivation.

Deadheading- Removing the dead blossoms. If a plant is termed “self cleaning,” the blossoms fall off on their own. Deadheading usually extends the blooming season.

Deciduous- A plant that loses its leaves seasonally, usually in the fall.

Determinate- The growth of a plant stops at a certain height (usually in reference to tomatoes).

Dormancy- A period in the life cycle of a plant where it is “asleep” and not actively growing. Dormancy is brought about by cool temperatures and shorter day length.

Evergreen- A plant that stays green year-round.

Falls- The lower petals of an iris bloom.

Floriferous- Bearing flowers/blooming freely.

Germination- The sprouting of a seed and the commencement of growth. Also used to describe the starting of plants from seeds.

Grafted Plant- The top (desirable) part of the plant is grafted onto rootstock, usually of a hardier or less rare plant.

Heirloom Seed- Mostly open-pollinated seed that have been planted and passed down for generations. Most lack disease resistance.

Herbaceous- A plant that dies back to the ground in winter and returns again in the spring.

Herbicide- A chemical used to destroy undesirable plants and vegetation.

Hybrid Seed- The result of cross-pollination of parents that differ in size, color, taste, or other traits. Seeds from hybrid plants cannot be saved and used again, as they will revert back to one of the parents.

Indeterminate- The plant continues growing until pinched or killed by frost (opposite of determinate). These plants usually require staking.

Inoculant- A species-specific bacteria that forms nodules on the roots of legumes (beans, peas, vetch) that enable these plants to make their own nitrogen. Without these bacteria in the soil, no nitrogen fixation occurs, and the nitrogen must be supplied through the use of complete fertilizer.

Integrated Pest Management (IPM)- An effective and environmentally sensitive approach to pest management that relies on a combination of common-sense practices. IPM programs use current, comprehensive information on the life cycles of pests and their interaction with the environment. This information, in combination with available pest control methods, is used to manage pest damage by the most economical means, and with the least possible hazard to people, property, and the environment. (Source:

Long Day/Short Day- Onions are traditionally classified as either long-day or short-day, though new varieties called “mid days” are here to complicate things. The “day” part of this term refers to the hours of sunlight. In the north, summer days are very long, giving your onions 14 to 16 hours of sunlight in which to ripen, so long-day varieties are the ones to grow. In the south, the day length tends to be shorter – there is less seasonal variation, with the average length staying around 10 hours. So short-day varieties are best grown in the south.

Organic Seed- A seed that has been grown and harvested without being exposed to any inorganic chemicals, fertilizers, hormones, etc.

Overwinter- You may have seen instructions for “overwintering” a particular plant, ignored them, and done just fine. Or you may have lost a certain plant that should have been hardy in your garden because a particularly harsh winter storm carried it off, or temperatures plummeted below expected levels.

Pelleted Seed- Small seed, such as petunias or pentas, that have been coated with an inert material such as clay to make them easier to handle.

Perennial- A plant that lives for three or more seasons. Perennials may not bloom the first season planted, especially ones that are shipped barefoot.

Permaculture- Bill Mollison and David Holmgren, who first coined the term in 1978, defined permaculture as: “The conscious design and maintenance of agriculturally productive systems which have the diversity, stability, and resilience of natural ecosystems. It is the harmonious integration of the landscape with people providing their food, energy, shelter and other material and non-material needs in a sustainable way.”

Planting on Center- When reading a plant label, you may have been given the baffling instruction to “plant on center” a certain distance apart. What this means is that the distance between plants should be measured from one central stem to the next central stem, NOT from the end of the branches. So if you are planting a row of Petunias 10 inches apart, that’s 10 inches from the middle of each plant, not the edge of the furthermost stems. This is especially important if you are planting groundcovers and want them to fill in evenly.

Repeat Bloomers- Usually go through short periods of time without flowering, but after this short period will bloom off and on until the end of the season. Some plants (roses, clematis) may bloom in the spring and repeat in the fall.

Rhizome- A somewhat elongated, usually horizontal subterranean plant stem that is often thickened by deposits of reserved food material that produces shoots above and below the roots (bearded iris).

Rootstock- Root system of a more common or hardy variety that is used to graft a more desirable variety onto, usually roses and/or standard forms.

Rose Hips- The seedpod that develops on a rose bush after the bloom fades. These come in different shapes, sizes, and colors and not all roses produce them.

Self-cleaning- refers to flowering plants that drop their spent flowers by themselves without the need to deadhead.

Self-Pollinating- Plants that do not require pollen from another plant in order to produce fruit.

Semi-Evergreen- A plant that drops its leaves in cold areas but keeps at least some of them in milder zones (typically zones 7~11).

Standard- A shrub or herb grown with an erect main stem so that it forms or resembles a tree.

Sucker- Undesirable growth coming from the rootstock of a grafted plant.

Treated Seed- Seed that have been treated with an insecticide or fungicide to aid in preventing soil insects or disease from destroying the seed prior to germination.

Tuber- A short, fleshy, usually underground stem bearing minute scaly leaves, each of which bears a bud in its axil and is potentially able to produce a new plant (iris potato, caladium, tuberose begonia).