The Collaborative International Dictionary of English v.0.48:

Garden \Gar"den\ (g[aum]r"d'n; 277), n. [OE. gardin, OF. gardin,
   jardin, F. jardin, of German origin; cf. OHG. garto, G.
   garten; akin to AS. geard. See Yard an inclosure.]
   1. A piece of ground appropriated to the cultivation of
      herbs, fruits, flowers, or vegetables.
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   2. A rich, well-cultivated spot or tract of country.
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            I am arrived from fruitful Lombardy,
            The pleasant garden of great Italy.   --Shak.
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   Note: Garden is often used adjectively or in self-explaining
         compounds; as, garden flowers, garden tools, garden
         walk, garden wall, garden house or gardenhouse.
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   Garden balsam, an ornamental plant (Impatiens Balsamina).


   Garden engine, a wheelbarrow tank and pump for watering
      gardens.

   Garden glass.
      (a) A bell glass for covering plants.
      (b) A globe of dark-colored glass, mounted on a pedestal,
          to reflect surrounding objects; -- much used as an
          ornament in gardens in Germany.

   Garden house
      (a) A summer house. --Beau. & Fl.
      (b) A privy. [Southern U.S.]

   Garden husbandry, the raising on a small scale of seeds,
      fruits, vegetables, etc., for sale.

   Garden mold or Garden mould, rich, mellow earth which is
      fit for a garden. --Mortimer.

   Garden nail, a cast nail, used for fastening vines to brick
      walls. --Knight.

   Garden net, a net for covering fruits trees, vines, etc.,
      to protect them from birds.

   Garden party, a social party held out of doors, within the
      grounds or garden attached to a private residence.

   Garden plot, a plot appropriated to a garden.

   Garden pot, a watering pot.

   Garden pump, a garden engine; a barrow pump.

   Garden shears, large shears, for clipping trees and hedges,
      pruning, etc.

   Garden spider, (Zool.), the diadem spider (Epeira
      diadema), common in gardens, both in Europe and America.
      It spins a geometrical web. See Geometric spider, and
      Spider web.

   Garden stand, a stand for flower pots.

   Garden stuff, vegetables raised in a garden. [Colloq.]

   Garden syringe, a syringe for watering plants, sprinkling
      them with solutions for destroying insects, etc.

   Garden truck, vegetables raised for the market. [Colloq.]


   Garden ware, garden truck. [Obs.] --Mortimer.

   Bear garden, Botanic garden, etc. See under Bear, etc.


   Hanging garden. See under Hanging.

   Kitchen garden, a garden where vegetables are cultivated
      for household use.

   Market garden, a piece of ground where vegetable are
      cultivated to be sold in the markets for table use.
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The Collaborative International Dictionary of English v.0.48:

Truck \Truck\, n. [Cf. F. troc.]
   1. Exchange of commodities; barter. --Hakluyt.
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   2. Commodities appropriate for barter, or for small trade;
      small commodities; esp., in the United States, garden
      vegetables raised for the market. [Colloq.]
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   3. The practice of paying wages in goods instead of money; --
      called also truck system.
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   Garden truck, vegetables raised for market. [Colloq.] [U.
      S.]

   Truck farming, raising vegetables for market: market
      gardening. [Colloq. U. S.]
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WordNet (r) 3.0 (2006):

garden truck
    n 1: fresh fruits and vegetable grown for the market [syn:
         produce, green goods, green groceries, garden
         truck]