The single largest UK promotion supporting gardening is changing from a voucher system, which grosses £25m annually, to an electronic card system.
Maxted said: "This will make the scheme a lot more efficient. We're future-proofing the industry.
"More and more paper-based voucher schemes are going over to electronic cards. It will be a more attractive option. We think the future lies with electronic cards and so does the Voucher Association. It's not 'if' but 'when'."
Payzone and HSBC are to set up card-processing facilities.
Garden centres will not need an additional terminal as the system will run off existing EPoS terminals, which will be able to process credit and debit cards, NGGV cards and mobile phone top-ups.
The system will start to roll out from October.