Adam's garden is planted in March (8)
I believe the answer is:
paradise
'adam's garden' is the definition.
'Paradise' can be an answer for 'garden' (I've seen this before). I am unsure of the 'adam's' bit.
'is planted in march' is the wordplay.
'planted in' indicates putting letters inside.
'march' becomes 'parade' (synonyms).
'is' going inside 'parade' is 'PARADISE'.
Can you help me to learn more?
(Other definitions for paradise that I've seen before include "Place of utter bliss" , "Elysian fields" , "Garden of Eden" , "Utopia" , "Happiness" .)