Not only does this comprehensive edible gardening guide instruct you how to choose and grow every variety of vegetable under the sun, it also includes instructions for irrigating, canning, and preserving. Indispensable for the novice or the advanced gardener.

$2.99, itunes.apple.com

Whether you're a photographer looking for the correct angle of sunlight or a gardener seeking the best plot for exposure, this 3-D view camera helps you to envision where the sun will be at every hour of the day at any geographic point of your choosing.

$4.99, itunes.apple.com

Keep your garden watered the eco-friendly way. Once Rain Harvest calculates your home's annual rainfall-capture potential, you might just be motivated to expand the garden.

Free, itunes.apple.com

Camping cooking can be tricky, especially if you're not an experienced campfire chef. Plan your trip's meals with Coleman's comprehensive recipe guide, which will base the selection on ingredients and number of days you'll be in the wilderness.

Free, itunes.apple.com

The ornithology fiend can appreciate this guidebook to nearly 1000 American birds. If you're one to log your own bird finds, iBird has a gallery feature that allows you to snap a photo and add notes so you can remember your rarest sightings.

$2.99, itunes.apple.com