A Gardener's Glossary: 40 Terms You'll Encounter in Your First Season

Hardiness Zone

A geographic designation — published by the USDA — that indicates the average annual minimum winter temperature in a region. Zones help gardeners choose plants most likely to survive local winters. Look up your zone on the USDA Plant Hardiness Zone Map using your zip code.

Annual

A plant that completes its entire life cycle — germination, growth, flowering, seed production, and death — within one growing season. Examples include marigolds, basil, and zucchini. You replant annuals each year.

Perennial

A plant that lives for more than two years, dying back to its roots over winter and re-emerging in spring. Coneflowers and hostas are common examples. Perennials typically cost more upfront but return year after year.

Biennial

A plant with a two-year life cycle: it grows foliage in year one, then flowers and sets seed in year two before dying. Foxglove and parsley are biennials. Many gardeners treat them as annuals.

Direct Sow

Planting seeds directly into garden soil rather than starting them indoors first. Crops like carrots, beans, and sunflowers prefer direct sowing because they don't transplant well.

Transplant

Moving a seedling — started indoors or purchased from a nursery — into its permanent outdoor spot. The term also refers to the seedling itself. Tomatoes and peppers are typically started indoors and transplanted outdoors after frost danger passes.

Hardening Off

The process of gradually acclimating indoor-grown seedlings to outdoor conditions before transplanting. Set plants outside for increasing amounts of time over 7–10 days to prevent transplant shock.

Frost Date

The average date of the last spring frost (or first fall frost) in your area. Frost dates guide when to safely start planting outdoors and when to wrap up the season. Local cooperative extension services publish these dates by zip code.

Deadheading

Removing spent (faded or dead) flowers from a plant. Deadheading redirects the plant's energy from seed production into more blooms, extending the flowering season.

Mulch

Any material layered on top of soil to retain moisture, suppress weeds, and regulate soil temperature. Common mulches include shredded bark, straw, and wood chips. A 2–3 inch layer is typical.

Tilth

The physical condition of soil as it relates to planting. Good tilth means the soil is loose, crumbly, well-aerated, and easy for roots to penetrate. Poor tilth — compacted or clumpy soil — limits plant growth.

Succession Planting

Staggering plantings of the same crop every 1–3 weeks so you harvest continuously instead of all at once. Commonly used with lettuce, radishes, and green beans.