The promotion starts on 6 April and runs through to 9 April, giving viewers the opportunity to win £2,500 of NGGVs to spend on their gardens.
Filming for the This Morning promotion took place at NGGV stockist Squire's Badshot Lea Garden Centre in Surrey. The programme's gardening presenter, David Domoney, spoke with customers about what they might spend their vouchers on if they won.
Squire's Garden Centres marketing co-ordinator Sally Fahy said: "The event provided a real buzz at the garden centre and staff enjoyed the fun atmosphere it created. We all look forward to seeing the finished programme in the run up to Easter and hope they will return for future filming."
HTA marketing manager David Butler said: "This a great opportunity for National Garden Gift Vouchers to receive prime-time television exposure. This campaign, which follows the recent promotion on The Alan Titchmarsh Show, will help to drive demand for vouchers as the weather warms and people start to think about gardening."