The online "eLearning" tool will include modules on product knowledge, customer service and food hygiene.
The software will allow users to personalise the modules with its own corporate branding.
A GCA statement said it had funded a "costed proposal…in order to get the project off the ground and, following significant support from member garden centres, the project will proceed this year".
Former GCA chairman, Dennis Espley said: "We are committed to helping members improve their businesses and as part of this we feel it is extremely important to provide garden centres with a resource that will ensure their continued professional development."
Kent-based Coolings Garden Centre chairman Paul Cooling said: "I feel that from the initial indication of cost, this represents excellent value for money."