Seed companies

Seed Savers Exchange

Decorah, Iowa, serving United States catalog and online orders. Listed as a reference, not an endorsement.

Overview

Seed Savers Exchange maintains a seed catalog and nonprofit preservation mission centered on garden and food crop heritage. This listing is provided for reference, not as an endorsement, certification, ranking, or guarantee of current availability.

Services and programs

  • Heirloom seeds
  • Seed catalog
  • Seed preservation education

What to verify before you go

Contact the organization or review its official source before making a trip, placing an order, joining a garden, or applying for funding. Details that commonly change include:

  • Current stock
  • Shipping rules
  • Cultivar growing information

Related directory resources

Browse all seed companies or return to the directory hub.

Sources and last verified

Source: Seed Savers Exchange catalog. Last checked 2026-10-04.

Seed Savers Exchange maintains a seed catalog and a nonprofit preservation mission centered on garden and food crop heritage. The catalog includes heirloom varieties and supporting information for choosing seed.

What this listing covers

The source documents heirloom seeds, an online catalog, and seed preservation education. Catalog availability can change during the growing season.

Before ordering

Review current stock, shipping rules, packet details, and cultivar maturity information. Compare the variety's days to maturity and disease notes with your local growing window.

More tools

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Growing zone lookup

Find your USDA Plant Hardiness Zone by ZIP code.

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Plan

What can I plant this week

See which crops are inside their planting windows right now.

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Calculate

Soil calculator

Calculate how much soil your garden needs.

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Calculate

Mulch calculator

Estimate mulch volume and bags required.

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Garden guides

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Greenhouse growing

Greenhouse temperature guide for seeds and seedlings

Use crop-specific greenhouse temperatures for seed germination, seedlings, frost protection, and ventilation, with practical day and night ranges.

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Diagram of a raised bed cross section showing timber walls, a layer of existing soil or coarse fill, and the measured depth of new soil being added.

Materials

How much soil does a raised bed need?

How to measure a raised bed and turn the volume into bags or bulk cubic yards, with a worked example for a common 8 by 4 bed.

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October calendar diagram showing planting windows for garlic, spring bulbs, hardy greens, and cover crops closing as the first fall frost approaches.

Seasonal

What can I plant right now in my garden?

In early October, most US gardeners can still plant garlic, spring bulbs, hardy greens, and cover crops. Here is what is still open and what has closed.

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Diagram of a tulip bulb in a soil cross section planted at about three times its own height, pointed end up, with a depth marker of 6 to 8 inches.

Fall planting

When should I plant tulip bulbs?

Plant tulip bulbs in fall, about 6 to 8 weeks before the ground freezes. Here is how the window shifts by region and how deep to plant.

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Plant library

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Illustration of a spinach plant with dark green rounded leaves

Vegetable

Spinach

A fast cool-season leafy green for spring and fall beds, containers, and repeated small sowings.

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Illustration of a broccoli head made of tight green florets

Vegetable

Broccoli

A cool-season brassica grown for its central head and the smaller side shoots that follow it.

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Illustration of a zucchini vine with lobed leaves and one oblong fruit

Vegetable

Zucchini

A fast warm-season squash that produces heavily, so one or two plants are usually enough for a household.

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Illustration of a kale plant with dark ruffled leaves

Vegetable

Kale

A hardy leafy green that tolerates frost, improves after cold nights, and keeps producing for months.

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Glossary terms

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soil

Cation exchange capacity

Cation exchange capacity, or CEC, describes how much positively charged nutrient a soil can hold and exchange with plant roots.

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timing

Chill hours

Chill hours describe the amount of cool winter exposure some fruit plants need before they can flower and grow normally in spring.

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pests and diseases

Chlorosis

Chlorosis is the loss of green color from leaves because chlorophyll is reduced. It can result from nutrient, root, disease, light, or environmental problems.

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plant biology

Companion planting

Companion planting means growing different plants near one another to manage space, timing, habitat, or a specific interaction. Pairing charts are not universal rules.

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Johnny's Selected Seeds

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Community gardens

American Community Gardening Association

The American Community Gardening Association is a grassroots nonprofit focused on community gardening and provides a searchable garden map.

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Community gardens

North Carolina Community Gardens directory

NC State Extension's directory page links gardeners to community garden databases and related resources.

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Native plant resources

Lady Bird Johnson Wildflower Center Native Plant Database

The Wildflower Center's Native Plant Database provides plant information with geographic context for native plant research and selection.

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