Many gardeners may prefer digging in the dirt to fiddling with a mobile device. But an increasing number of gardening apps now available might change that attitude, by helping with tasks like designing plots and choosing crops, and perhaps improving yields. The apps range in price from free to about $10 — although a higher price doesn’t guarantee a better or more sophisticated program. Here are some of the freshest picks.

• Garden Tracker for iPad ($3.99) and iPhone (99 cents)

This app allows you to design rectangular gardens of up to 2,500 square feet: Enter the desired number of rows and columns to create a grid with a series of boxes, each one representing a square foot. Click inside each box and choose the crop you’ll plant there from a list of about 65 plants typically found in kitchen gardens.

The program tells you how many of your chosen plants each square foot of your garden will accommodate. It also gives general care information including watering needs, ideal soil temperature and planting depth, and tells which plants are incompatible — say, pole beans and cabbage.

Registers for recording a variety of information (the date you planted seeds or seedlings, and when you last watered and fertilized) allow the app to function as a garden logbook. And a handy reference list of pests helps identify troubling bugs and blight, with advice on eradicating them.

• Home Outside for iPhone and iPad ($2.99)

While Garden Tracker is limited to rectangular plots, Home Outside allows you to create intricate and varied landscapes. Five starter templates can be manipulated in myriad ways to suit your tastes and imagination: add and subtract shrubbery, trees, water features, pathways, lounge furniture, fire pits and even laundry lines. You can also change the color palette of the graphics to suit your mood. And when you’re finished designing your yard, you can email results to friends.

• Landscaper’s Companion for iPhone and iPad and Android devices ($5.99)

This app has no design capabilities, but it is a handy reference tool with information on a variety of plants, including trees, shrubs, annuals, perennials, vegetables and herbs — about 20,000 varieties in all, most with accompanying images. And unlike many reference apps, it allows you to search by category, common name, scientific name, sun exposure, United States Department of Agriculture zone, water requirements, color, height and width. You can also save plants you like and create an album of favorites.

• iVeggiegarden for iPhone and iPad ($9.99)

This is great for garden geeks more interested in obsessively tracking every aspect of the growing season than designing a plot. You create a garden using the simple, uncluttered interface, then add plants from an index of 50 vegetable types and 500 varieties. For each plant, there are growing tips tailored to your USDA zone and pictures of common pests. Also useful is the notes section, a form for recording key dates such as when seeds were planted, when plants flowered and when they were harvested.

• Gardening for iPhone and iPad (99 cents)

This is a basic app, useful for tracking your garden’s progress. And it’s a good value. There’s no design feature, but it provides 50 plant options, along with decent growing and care instructions and alerts to common problems. The Wikipedia entry for each plant is included, which links you to all sorts of additional information online. There’s a place to record the date you planted seeds, and the app automatically calculates the number of days until harvest (not much help if you plant seedlings). There’s also a journal tab with a blank page to add more information.

• Leafsnap for iPhone (free)

Developed by researchers at Columbia, the University of Maryland and the Smithsonian Institution, it helps identify trees when users snap pictures of the leaves. It also contains countless photos of bark, blooms, flowers, fruit and seeds uploaded by users. And the photographs are geotagged, which means you can see where the picture was taken and find the specimen for yourself — that is, if you’re in New York City or Washington. At the moment, the app doesn’t include trees from other areas, but eventually the developers plan to cover the entire U.S.