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According to the US Customs web site the following agricultural products are allowed to be brought in the US.

Originally Posted by www.customs.ustreas.gov

General List of Approved Products

Aloe Vera (above ground parts)
Bat nut or devil pod (Trapa bicornis)
Breads, cakes, cookies, and other bakery goods
Candies
Cannonball fruit
Chinese water chestnut
Coffee (roasted beans only)
Fish
* Flower bulbs
Fruits, canned
Garlic cloves (peeled)
Lily bulbs (Lilium spp.) for planting
Maguey leaf
Matsutake
Mushrooms
Nuts (roasted only)
Palm hearts (peeled)
Sauces, canned or processed
Seaweed
* Seeds for planting or consumption
Shamrocks leaves without roots or soil
St. John's Bread
Singhara nut (Trapa bispinosa)
Tamarind bean pod
Truffles
Vegetables, canned or processed
Water chestnut (Trapa natans)

*Check with the consulate or agricultural office in the country of origin to confirm that your item is allowed. A phytosanitary certificate is required for propagative material. Pre-departure inspection is required for passengers traveling from Hawaii to the mainland, Puerto Rico to the mainland, and from the U.S. Virgin Islands to the mainland.

Many products grown in Canada or Mexico are allowed to enter the United States. This includes most vegetables and many fruits; however, seed potatoes from Canada currently require a permit. Additionally, stone fruit, apples, mangoes, oranges, guavas, sopote, cherimoya and sweet limes from Mexico require a permit.

According to the US Customs web site, here's what could happen to you if you're caught with prohibited agricultural products.

Originally Posted by www.customs.ustreas.gov

Avoid Fines and Delays

Prohibited items that are not declared by passengers are confiscated and disposed of by CBP agriculture specialists. But that’s not all. Civil penalties may be assessed for violations and may range up to $1,000 for a first-time offense. Depending on whether the confiscated, undeclared items are intentionally concealed, or determined to be for commercial use, civil penalties may be assessed as high as $50,000 for individuals. The same fines apply to prohibited agricultural products sent through the international mail.

Additional info on this topic can be found on the US Customs web site --- click here .