Do I have to replace Mel’s Mix or amend the soil?

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<blockquote class="wp-embedded-content" data-secret="qjk7Ne33rJ"><a href="https://squarefootgardening.org/2019/05/do-you-have-to-replace-mels-mix/">Do I have to replace Mel’s Mix™?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://squarefootgardening.org/2019/05/do-you-have-to-replace-mels-mix/embed/#?secret=qjk7Ne33rJ" width="600" height="400" title="&#8220;Do I have to replace Mel’s Mix™?&#8221; &#8212; Square Foot Gardening" data-secret="qjk7Ne33rJ" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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