RHS membership packs come with merchandising kit including posters and pack dispensers. Each pack of 10 costs £219 + VAT and one membership has a recommended retail value of £49.
HTA marketing director Andrew Maxted said: "The RHS membership pack will appeal both to keen gardeners and those looking for a gift for friends or family."
RHS marketing director Dan Wolfe said: "With its network of garden centre members, the HTA is the perfect partner to help us broaden our reach by distributing a retail membership pack that has year-round validity."
The HTA and the RHS are also co-producing a new series of videos based on their jointly-branded Easy Guide leaflets. The first videos will be launched at the HTA National Plant show on 29 June.