Apex domains cannot have CNAME records.
Question and response
Question
dig plantsoftherocks.com. NS
Answer
plantsoftherocks.com. 5 NS ns2.plantsoftherocks.com.
plantsoftherocks.com. 5 NS ns1.plantsoftherocks.com.
Authority
The response has no authority records.
Additional
ns1.plantsoftherocks.com. 5 A 149.50.96.18
ns2.plantsoftherocks.com. 5 A 149.50.99.86
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0