Your title tag(Deep Roots | Home), h1 (About Deep Roots), an image (file name and alt are the most important areas here) need to feature the entire keyword - deep roots home and garden center.
Once this is done I would recommend setting up a Google Search Console account. Go through the set up instructions to ensure everything is complete. Once that is done, I would ask Google to 'fetch' the URL. This will force a crawler to look through your site and reference the new changes you have made to the title tag etc. This may take 24 hours to show up.
In addition to that I would recommend reading the MOZ Beginners Guide to SEO. This is where I started a few years ago, and it really helped me improve my knowledge.
Hope thats useful 
