Joe spends 4.50*3 = <<4.50*3=13.50>>13.50 on oranges.
Joe spends 7*0.5 = <<7*0.5=3.50>>3.50 on juice.
Joe spends 3*5 = <<3*5=15>>15 on honey.
Each plant costs 18/2 = <<18/2=9>>9 dollars.
Joe spends 9*4 = <<9*4=36>>36 on plants.
Joe spends a total of 13.50+3.50+15+36 = <<13.50+3.50+15+36=68>>68 dollars at the market.
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