‘… is not the only Downside.’ (paragraph 4)

What does the underlined word mean?

Negative side
Discussion:
But, the amount of time it takes to grow foods industrially compared with organic methods is not the only downside. Another disadvantage to organic gardening is that these gardeners are usually not able to use genetically modified food crops. But genetically modified, or GM, food crops are able to resist pests, which is major plus for industrialized and conventional gardens.
All in all, there are many advantages and 
disadvantages to organic gardening. But organic or not, a lot of it is dependent upon your preference and choices.
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