Wondering when your favorite fruit / veggie will be available in the Garden State? Take a look at this chart. (My suggestion is to stick to the "most active" dates, as that should be the bulk of the harvest.)
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Heritage Winery
LAT: 39.723930
LON: -75.172325

This is one of the best kept secrets of South Jersey. Excellent wines, great staff. Wine tasting on site. They have BBQ during the summer. They also have a U-Pick orchard of all manner of fruit trees. Petting zoo for the kids. [NOTE: Try the "Jersey Red" wine -- it's our fave!]

  Moods Farm Market
LAT: 39.667851
LON: -75.209673

If you don't know Moods, you don't know South Jersey. A long-time U-pick farm with pretty much every crop you might find in Jersey. Too long to list. Find their web site to see what's being picked (everything is seasonal there). NOT open on Sundays.
  Sauders Farm Market
LAT: 39.499070
LON: -75.091558

Great little farm stand and nursery. Nice selection of flowering plants, bedding plants, and bushes. During growing season they have the BEST cantalope and veggies. When no one is around, there's an honor box -- so bring small bills and some change.
  Garden Road Greenhouse
LAT: 39.535775
LON: -75.128489

Nice nursery, decent prices. Carry trees, shrubs, bed plants. They have a few hot houses. They also carry pumpkins in the fall, etc.
 
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Fruitwood Orchards Honey Farm
LAT: 39.668417
LON: -75.187399

A great location for local honey. Sadly, the main store is only open during the week, but the stand out front is open during the summer months on the weekend.
  Roadside Farm Stand (#1)
LAT: 39.536540
LON: -75.132819

One of many in South NJ. Probably not open until at least the end of May.
  Sorbello Girls Farm Market
LAT: 39.683966
LON: -75.206380

Just one of the many "hidden" farm stands of South Jersey. This is a larger one, with a big variety of fruits and veggies. Also bedding plants, and from time to time, flowers. Very nice staff -- a true farming family. [Note: OPEN as of May 2, 2009... at least on weekends. OPEN on Sundays.]
  "U-Pay Apples" (Richwood Orchards?)
LAT: 39.714805
LON: -75.168227

Okay, so it's not the actual name of the place, just the nickname I gave it. Basically, it's a warehouse bay filled with cheap, bagged apples -- and an "honor box". Take what you want, and leave the money in the box. Bring lots of singles, since they don't give out change -- and don't visit until apples are being harvested (Around late September).
 
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Roadside Farm Stand (#2)
LAT: 39.577883
LON: -75.089782

One of many in South NJ. Probably not open until at least the end of May.
  Roadside Farm Stand (#3)
LAT: 39.667792
LON: -75.186983

One of many in South NJ. Probably not open until at least the end of May.
  Roadside Farm Stand (#4)
LAT: 39.644474
LON: -75.123373

One of many in South NJ. Probably not open until at least the end of May.
  Weavers Farm Market
LAT: 39.528750
LON: -75.100014

A larger farm/nursery stand. A great place for fresh veggies and fruit. They also offer a few hot-houses of flowering plants and bedding plants, as well as some garden materials (fertilizer, etc.). Not open on Sundays.
 
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D'Angelo's Farm Stand
LAT: 39.690930
LON: -75.174306

Looks to have a decent selection of green-house raised flowers. I didn't notice any produce, but I didn't get a chance to stop in.
  Bertuzzi's Market
LAT: 39.463232
LON: -74.878415

Wow! If you're looking for great pie, this is the place to go. Just amazing bakery. They also have a large selection of fruit and veggies, and a large selection of herb plants, bedding plants, and flowers. Totally a "one stop shop" for weekend fun.