Image courtesy of Fiskars
A rounded-blade digging shovel is indispensable if you're planting anything larger than your fist. Shovels have come a long way ergonomically, and this one is a good example. The D-shaped handle helps gives you two-handed control when digging up and tossing heavy loads of soil. The welded steel construction is more durable than wood and won't flex under a heavy load as fiberglass would. Meanwhile, the large step plate is wide enough to relieve pressure on your foot when stepping on it repeatedly. Available from Fiskars and local retailers.
Image courtesy of Fiskars.