americanmeadows.com - American Meadows (wildflower seeds and bulbs)
botanicalinterests.com - Botanical Interests (seeds)
burpee.com - Burpee
edenbrothers.com - Eden Brothers (bulbs and heirloom seeds)
highmowingseeds.com - High Mowing Organic Seeds
johnnyseeds.com - Johnny's Selected Seeds
parkseed.com - Park Seed (since 1868)
rareseeds.com - Baker Creek Heirloom Seeds
seedsavers.org - Seed Savers Exchange (nonprofit heirloom seed bank)
territorialseed.com - Territorial Seed Company
tomatogrowers.com - Tomato Growers Supply Company
bopf.com - Brown's Omaha Plant Farms (onion plants)
davidaustinroses.com - David Austin Roses
garlandtruffles.com - Garland Truffles (truffle-inoculated trees, NC)
jacksonandperkins.com - Jackson & Perkins (roses)
plantdelights.com - Plant Delights Nursery (perennials, Raleigh NC)
starkbros.com - Stark Bro's (fruit trees)
whiteflowerfarm.com - White Flower Farm
equip2garden.co.uk - Equip2Garden (UK garden tools)
felco.com - FELCO (Swiss pruners)
fiskars.com - Fiskars
forestry-suppliers.com - Forestry Suppliers (benmeadows.com now goes here)
gardeners.com - Gardener's Supply Company
homebyames.com - AMES (shovels, rakes and hoses; ames.com now goes here)
implementations.co.uk - Implementations (hand-made bronze garden tools, UK)
imustgarden.com - I Must Garden (natural animal and pest repellents)
lowes.com - Lowe's
designtoscano.com - Design Toscano (garden statues)
oxfordgarden.com - Oxford Garden (teak garden furniture)
pallensmith.com - P. Allen Smith (garden design and ideas)
extension.org/find-extension - Find Cooperative Extension in your state (free local garden advice)
gardening.ces.ncsu.edu - NC State Extension gardening
plantfinder.mobot.org - Missouri Botanical Garden Plant Finder
planthardiness.ars.usda.gov - USDA Plant Hardiness Zone Mapplants.ces.ncsu.edu - NC Extension Gardener Plant Toolbox
almanac.com/planting-calendar - Old Farmer's Almanac planting calendar
audubon.org/native-plants - Audubon native plants database (plants for birds)
epa.gov/composting-home - EPA: composting at home
finegardening.com - Fine Gardening magazine
gardenweb.com - GardenWeb forums (now part of Houzz)
nwf.org/native-plant-habitats - National Wildlife Federation: native plant habitats
rhs.org.uk - Royal Horticultural Society (UK)
xerces.org - Xerces Society (pollinator-friendly gardening)