You have closed the 'row' too early and missed out a closing row </div>, see in red below:
<div class="row">
<div class="col col-md-one-half">
<div class="info-box-medium">
<h4>PRODUCTS FOR GROWING</h4>
<p>Annual and Perennial Flowers<br>
Vegetables and Herbs<br>
Cover Plants, Shrubs and Trees<br>
By Pound or Pack Seeds and Bulbs<br>
Gloves, Hats and Garden Tools<br>
Soil Treatments and Fertilizers<br>
</p>
<h4>Click <u>Here</u></h4>
</div>
</div>
</div> <!-- wrong place - this closes the row too early, move it to as shown below in red-->
<div class="col col-md-one-half">
<div class="info-box-medium">
<h4>PRODUCTS FOR SHOWING</h4>
<p>Pots, Ceramics and Planters<br>
Garden Globes, Statues and Gnomes<br>
Bird Seed and Bird Feeders<br>
Chimes, Flags, Crystals and Gifts<br>
Watering and Hydro-Control<br>
Seasonal Gifts and Gift Cards<br>
</p>
<h4>Click <u>Here</u></h4></div>
</div>
</div><!-- right place - ends the row in the correct place-->
<div class="row">
<div class="col col-md-one-third">
<div class="info-box-dark">
<h4>Sales and Specials</h4>
<p>Click <span style="color: #FFFD00; font-weight: 400;">HERE</span> to see our latest sales and upcoming specials. Bookmark this page and check back often for the best deals!</p>
</div>
</div>
<div class="col col-md-one-third">
<div class="info-box-dark">
<h4>Classes and Events</h4>
<p>We love sharing knowledge! Click <span style="color: #FFED00; font-weight: 400;">HERE</span> to see our latest classes, festivals, contests special events and more.</p>
</div>
</div>
<div class="col col-md-one-third">
<div class="info-box-dark">
<h4>Guilford Garden Blog</h4>
<p>Written by our own Christina Larson, our <span style="color: #FFED00; font-weight: 400;">BLOG</span> covers a wide range of garden topics helpful to all gardeners.</p>
</div>
</div>
</div><!-- add closing row tag -->