There isn't a vaccine for spring fever. But if you develop a little resistance of your own, experts say you'll prevent some problems when sunny days start drawing you toward your garden.

"When you've had lots of rain, as we've had lately, you really need to stay out of the garden," said Bob Westerfield, the University of Georgia Cooperative Extension consumer horticulturist.

Soils with lots of clay, as most central and north Georgia soils have, can hold moisture a long time. To be sure it's ready to till, he said, do an old-fashioned ball test.

Just grab a handful of your garden soil and squeeze it into a ball. When you open your hand, you should have a clump that's firm but crumbles easily.

It shouldn't be firm and look glossy. You shouldn't be able to see the moisture in it. "If you till soil like that, you can create big clods," Westerfield said. In essence, you could be turning your soil into a pile of bricks. "That won't be good for your garden."

Even if the soil moisture is fine, don't rush to plant. There's something else you need to monitor: the temperature.

Just stick an outdoor thermometer into the soil to find out its temperature, Westerfield said. Or log onto georgiaweather.net, scroll down to the map and click on the dot nearest you. Click "Current Conditions" and scroll down. Near the middle of the list are the soil temperatures at 2, 4 and 8 inches deep. "For summer vegetables like squash, tomatoes, peppers and okra, wait until your soil gets above 60 degrees at the 4-inch depth," he said.

Seeds won't germinate and transplants won't do well if the soil's too cool. If it isn't warm enough to encourage root growth, plants will just sit. Then they become vulnerable to root rot and other diseases.

"I've heard old-timers say to plant on Good Friday or dates like that," Westerfield said. "That may be good one year and bad the next. It's best just to monitor your soil moisture and temperature."

If the soil is dry enough to work but still too cool for summer vegetables, there are some crops you can put in now. "You can plant coolseason crops like potatoes, carrots, lettuce and onions," he said.

And where you want to plant summer crops, there are other things you can do. The most important is to take a soil sample. Find out your soil's needs, especially its pH.

Most summer vegetables need a soil pH in the 6.5 to 6.8 range. If your soil test shows you need to add lime, go ahead and till it into your soil if it's dry enough to work.

If your garden site isn't on an erodible slope and the soil is dry enough, go ahead and till it, Westerfield said. That can expose nematodes and other pathogens to the killing sun.

You can ease your spring fever, too, by sharpening tools, making sure your equipment is running smoothly and buying fertilizer and supplies.

It's a good time, too, to start seeds of summer vegetables indoors.