Bets they belong to the gardener (6)
I believe the answer is:
stakes
'bets' is the definition.
(staking is a kind of betting)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for stakes that I've seen before include "prize money" , "Pointed poles or bets" , "Pales" , "Hazards" , "Wagers with pointed poles" .)