Good Morning Steve, 

Thank you for contacting the U of M Extension Service. 

Do you mean you purchased waist high greenhouse plants and brought them home and now they are failing?  I would ensure the plants are getting all day sunshine or grow lights. Check the moisture in the pots. Inspect the plants for any signs of disease or pests. Have they been protected as you transported them? 

Here is a link from the U of M Extension Yard and Garden website about growing tomatoes: 

https://extension.umn.edu/vegetables/growing-tomatoes#finding-and-buying-tomato-plants-173310

Good Luck!