An expression enhancer comprising, in series, a CPMV 5'UTR nucleotide sequence comprising nucleotides 1-160 of SEQ ID NO:1, or comprising a nucleotide sequence comprising from about 80% to 100% sequence similarity with SEQ ID NO:1, and a stuffer fragment is provided. The stuffer fragment comprises a nucleotide sequence encoding an incomplete M protein and one or more kozak sequence active in a plant. Plants and plant matter comprising the expression enhancer and methods using the expression enhancer are also described.
