What to put into a garden shed

Gardening hand tools
Use a stand specifically designed to hold long handled tools in an upright position or store the tools on the wall using spring mount clips or other tool-holding device. Long handled tools may include a garden rake, leaf rake, shovel, spade, farm fork, edger, and hoe. Store mid-handled tools, like loppers or hand saws, on a shelf or hang from wall hooks.
Place short-handled garden tools flat in a drawer, on a shelf, or on wall hooks. I keep some of my garden hand tools standing up in empty plastic coffee containers. Short-handled tools may include hand spade (trowel), 3-tong fork, pruners, tiller, weeder, grass clippers, and scissors. I have a sturdy canvas bag with exterior pockets in which I place my most often used hard garden tools. Inside are gloves for different tasks and trash bags. I take the bag with me to tend to plants.
Lawn and garden equipment
Use floor space for wheelbarrow, lawn mower, chicken wire, and other large equipment. I have a four-wheeled garden wagon that I pull around the yard to collect trimmings from trees and shrubs, or to tote new plants or mulch to a desired location.
Other gardening supplies
Roll up a drained garden hose and lay flat, perhaps under the garden table, for winter storage indoors. Use shelves to hold flower pots, string, gardening magazines, or books. Seed packets might be stored on a shelf or in a drawer. If your garden shed has a window, add a potting table. I use an old 30 by 40 inch table, which is a good size for filling flower pots.
Potting supplies, such as potting soil, vermiculite, perlite, sand, rooting hormone, and flower pots, fit in any open space on a shelf, garden table, or the floor. A high shelf is the best place for bottles (or bags) of fertilizer, bleach, and pest or weed killers. Keep weed spraying equipment and chemicals out of reach from children and pets.

I use empty milk containers to hold water for use on seed pots or on cuttings for propagation. Speaking of water, one or two large watering cans are a must. I prefer plastic for its lightweight, non-breakable nature. Watering cans most likely spend the summer near a garden hose or spigot, and should spend the winter on a shelf indoors.
Don't have a garden shed?
Me neither! My mud-worthy garden shoes and sun hats are on hooks in the breezeway that connects the house to the garage. That unheated breezeway is also the location for my garden table where I work with cuttings and fill flower pots. The garage is the place for my garden wagon and long-handled tools.
Garden shed picture courtesy of Steenbergs